- How To Care For A Shamrock Plant
- How To Care For Oxalis Triangularis
- Why Is Oxalis Triangularis Called False Shamrock?
- Soil Conditions For Oxalis Triangularis
- Light Conditions For Oxalis Triangularis Plants
- Indoor Temperature Requirements
- How Often To Water Oxalis Triangularis
- Humidity Requirements
- Oxalis Triangularis Fertilizer Needs
- Pruning Requirements
- Care Through Dormancy
- How To Plant Oxalis Triangularis Bulbs
- Repotting Oxalis Triangularis
- Propagating New Plants
- Disease Problems
- Pest Problems
- Why Are My Purple Shamrock’s Leaves Turning Yellow?
- What Causes White Spots On My Purple Shamrock’s Leaves?
- How Can I Propagate New Oxalis Triangularis Plants?
- Is Oxalis Triangularis Toxic To Cats?
- Do Purple Shamrock Leaves Close At Night?
- Ask a Master Gardener: Caring for an oxalis (shamrock plant)
- Purple Shamrock
- Purple Shamrock Care Tips
- Shamrock Plant Disease
- Shamrock plants are beautiful delicate plants that are a favorite of many people.
- Oxalis houseplant disease
How To Care For A Shamrock Plant
I was recently given a gift of clovers, or oxalis deppei, as an early Saint Patrick’s Day present. I was very excited, but I had no idea how to care for a shamrock plant!
When I was a little kid, I spent countless hours looking for four-leaf clovers. I never found any, but I have always loved shamrocks. I was recently given a gift of oxalis deppei as an early St. Patrick’s Day present. I was very excited to see all of those tiny green clovers, but then I realized I had no idea what to do with it.
Do I keep it inside?
Do I run out in the cold and plant it?
How often should I water it?
Sun? Shade? Part-Sun? Part Shade?
I was definitely stressing out about this little plant. But, I tend to do that whenever I acquire things like plants and fish. (Long story for a different day.) So, I hopped online and learned that this little shamrock plant is my kind of plant. Apparently, it’s a no-fuss kind of plant!
If you have a little plastic pot of shamrocks, they are most likely an indoor variety. They prefer cool air, damp soil, and bright indirect, light. If you choose to put your shamrocks in a different container, go with something small. They have a very simple root system and do best in somewhat cramped conditions.
Your plant will go dormant two or three times a year. During this time, your plant will start to turn brown and the leaves will fall off. Stop watering, let it die back, and then place your plant in a cool dark place. Your plant will “wake up” after a few months. When you see green again, put it back in the light and start watering. Then, just sit back and enjoy your shamrocks. And, feel free to look at each and every clover looking for that lucky four-leafed one!
- Shamrocks for St. Patricks Day
- How to Grow and Care for Shamrocks
- Oxalis – Wikipedia
Thanks for Reading!
Want some shamrock crafts for Saint Patrick’s Day?
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- Rustic Shamrock Garland
- Coffee Filter Shamrocks
- Shamrock Barrette Tutorial
- A Shamrock Tree
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“Shamrocks” are really Oxalis species.
At this time of the year, ‘shamrock’ plants are sold in grocery stores, discount stores and floral shops as a decoration for St. Patrick’s Day. There really is no such thing as a shamrock plant; shamrock is just a corruption of an Irish word that means ‘little clover” and generally refers to white clover (Trifolium repens). The plants marketed for this holiday are actually species of Oxalis, also known as wood sorrels, that have clover-shaped leaves. Most oxalis have leaves with 3 or 4 leaflets, but some have up to 9 divisions. The leaves come in shades of green, red, or purple, and some are patterned. The leaflets of many of these species are nyctinstic, meaning the leaflets fold up at night or on overcast days. The five-petaled flowers are borne on long stalks. Different species have white, yellow, pink or red flowers. They are unrelated to clovers even though the leaves may look very similar.
Oxalis species may have green, purple or patterned leaves.
When selecting oxalis plants for a seasonal decoration, choose those with lush, healthy foliage and lots of new flower buds.
All Oxalis species have 5-petaled flowers on long stalks.
All of these Oxalis species need cool conditions, especially when in bloom, and bright light to thrive indoors. A bright sunny window where the temperature is no greater than 75ºF during the day and 15-25 degrees cooler at night is a good location. Keep the soil barely moist, but not wet. Most types cantolerate slight drying between waterings. Fertilize monthly only when plants are actively growing. Oxalis have few pests, but aphids or whiteflies may occasionally infest the plants.
The plants will start to decline after a few months, usually during the summer. “Shamrock” Oxalis species grow from small bulbs and need a rest period. Instead of throwing the pot out, allow the plants to go into dormancy. When the leaves start to die back, stop watering and allow the leaves to dry out and turn brown. Remove the dead leaves and place the container in a cool, dark spot for 2-3 months (except the purple-leaf types, which only require about a month’s dormancy).
“Shamrocks” make a good houseplant or can be planted outdoors for the growing season.
After this enforced rest period, move the container back to the bright window and begin watering again and fertilize. Or repot before returning the bulbs to the sunny window. Place them just under the soil surface in a well-drained soilless medium. New growth should begin to emerge soon thereafter.
Oxalis are easy to propagate when dormant by dividing the many small bulbs. The bulbs separate easily and can be potted up in small groups.
Although these species of Oxalis are not hardy in our area, they can be planted outside in the spring after the danger of frost has passed. Use them as an edging along a border, in containers or hanging baskets, or other places where their patterned leaves and small flowers can be appreciated. They should do well throughout the summer, but must be brought inside in the fall.
There are hundreds of species of Oxalis native to tropical and subtropical Central and South America and Southern Africa, but the most common species sold as Shamrocks, or as houseplants, include:
- O. acetosella, wood sorrel – has green leaves with 3 triangular leaflets and white flowers. There is a variety rosea that has pink flowers.
- O. deppei – has 4 green leaflets with white streaks long the leaf vein and pink flowers. It is also sometimes called the Iron Cross plant or Lucky Clover.
- O. purpurea, Cape oxalis – has 3 dark green, diamond-shaped leaflets and white or pink flowers.
Oxalis regnelii ‘Atropurpurea’
O. regnelii – the leaves are dark purple or burgundy on the undersides. It grows about 8” tall and has white or red flowers.
- O. regnelii ‘Atropurpurea’ – a South American native with triangular leaflets and almost black-purple foliage with a dramatic V-shaped blotch in lighter purple.
– Susan Mahr, University of Wisconsin – Madison
With its stunning and eye-catching purple foliage, Oxalis triangularis or Purple Shamrock is sure to be the star of the show wherever placed indoors. Provided the proper indoor growing conditions, it will provide you with robust growth and color throughout the seasons. Below is a quick summary of its care.
Oxalis Triangularis care summary: To keep your Purple Shamrock plant healthy, grow in rich, well-drained potting mix and water when the top inch of soil becomes dry. Maintain moderate humidity, fertilize every two to three weeks, situate in bright light and keep indoor temperature between 60°F to 75°F.
Continue reading because we have taken all the mystery out of growing and caring for Purple Shamrocks indoors and having healthy plants showcasing their purple glory.
How To Care For Oxalis Triangularis
Purple Shamrock owns its name triangularis due to the triangle shaped leaves in a deep purple, with a lighter purplish-rose feature in their center. Although the robustly colored leaves are the stars of the show, the plant also produces small, trumpet-shaped flowers in spring in colors of pink or white. The blooms last for several weeks. Another feature of the leaves is they open during the daytime hours and close in the evening.
Those living in mild climates can grow Oxalis Triangularis year-round outdoors as a ground cover. If your conditions are too cold in winter, you can dig the bulbs and store until spring’s warm temperatures arrive again. Plants average around 12 inches tall at maturity.
Purple Shamrock is sure to be an indoor feature and grab the eye’s attention whether grown alone in a container or part of a mixed container garden. It is quite attractive when mixed with plants with silver or white foliage like Dusty Miller or Spider Plant.
In fact, the Royal Horticultural Society has awarded Purple Shamrock the Award of Garden Merit. When properly cared for, Purple Shamrock will grace your indoor space with their outstanding color for years to come.
Why Is Oxalis Triangularis Called False Shamrock?
Another common name for Oxalis triangularis is False Shamrock, because many times it’s commercially marketed as a true shamrock or clover (Trifolium spp.), native to Ireland.
This is due to Purple Shamrock’s three petals and similar looks to that of clover. Actually, it is a member of the wood sorrel family and is a Brazilian native.
Some of the major differences between the Purple Shamrock and true shamrocks is it is better adapted to indoor growing conditions, as the conditions aren’t bright enough for clovers to grow properly. In addition, true shamrocks have a fibrous root system, whereas Purple Shamrock and most species of Oxalis have a bulb-like or tuberous root system.
Another major difference is true shamrocks perform as annuals and the Purple Shamrock is a perennial, although it usually goes through a period of dormancy about once per year.
Oxalis Triangularis (This plant is only five weeks old, but already looks amazing).
Soil Conditions For Oxalis Triangularis
Oxalis triangularis performs well when grown in standard potting mixes that drain well. The bulbs or fibrous roots will rot if planted in soils that are too heavy and retain too much water.
For the best results, use a rich, lightweight potting mix with or without the addition of a slow-release fertilizer. The addition of a fertilizer into the potting mix only means you will not have to worry about fertilizing as frequently as you would with mixes lacking the addition of the fertilizer.
Many types of potting soil are too heavy and don’t drain properly, which can lead to problems with rot. However, if that is what you have on hand you can lighten the mixture before planting your Purple Shamrock. Some soil mixture suggestions include:
- Mix one part potting soil with one part potting mix
- Mix one part potting soil with one part peat
- Mix one part potting soil, one part potting mix, one part peat
Whatever mixture you decide to use to grow your Purple Shamrock, the biggest thing to remember is the soil needs to drain properly and not retain too much water. If after you water you notice the water remains on top of the soil, draining slowly, the mixture is too heavy and needs to be lightened.
Oxalis Triangularis planted in a light potting mix with added vermiculite to improve drainage.
Light Conditions For Oxalis Triangularis Plants
For the best growth, place your Purple Shamrock in an indoor location that receives bright light. If indoor light conditions are too low, the plant’s growth won’t be as robust and it will have a tendency to become leggy.
If you notice this becoming a problem with your Purple Shamrock, just move it to a brighter location. If you desire to give your plant a break from indoor growth, place it in a partially sunny outdoor location and not in full sun. Although it grows best in a bright location indoors, the window reduces some of the sun’s rays and if the location outdoors is too sunny, the leaves can burn.
Indoor Temperature Requirements
The prime indoor temperatures that produce the best growth for Purple Shamrocks are between 60°F to 75°F. When temperatures inside the home become too hot, the foliage will wilt. During winter when conditions inside the home can be warmer due to artificial heating, make sure the plant is not sitting next to a heating vent.
How Often To Water Oxalis Triangularis
Your Purple Shamrock will be more forgiving if you forget to water than if you water too much, which leads to soggy soil conditions and problems with rot. Constantly wet conditions can end up killing your plant, so it’s imperative to water properly.
- During the growing seasons of spring through summer, water when the top inch of soil feels dry.
- During the dormant season of fall and winter, water about every two to three weeks.
It is easy to check if your Purple Shamrock needs water by sticking your finger into the soil. If the top inch or so feels dry to the touch, apply water until it runs from the pot’s bottom drain holes.
During the dormant season, the plant has suspended its growing so it does not require the amount of water it needs while actively growing. When watering, use room temperature water and not water that is too cold.
For more tips on how to assess when your houseplants need water, see this article
Although the foliage of Oxalis triangularis is generally considered to be the star attraction, the flowers are also beautiful
When it comes to proper humidity levels for Purple Shamrock to grow properly, it is not as fussy as many indoor plants. Average humidity levels inside the home are usually adequate.
If the air in your home is particularly dry, here are a few great ways to improve humidity easily.
Oxalis Triangularis Fertilizer Needs
Like watering, you only have to worry about feeding your Purple Shamrock while it is actively growing in spring through summer. Stop feeding in fall and winter when the plant goes into dormancy.
If your potting mix contained a slow-release fertilizer, which continues to feed the Purple Shamrock for up to three months, you won’t have to worry about additional feedings for several months. If you choose to continue feeding using a slow-release blend, scatter the granules over the soil and water in well after applying.
Otherwise, use a water-soluble blend for houseplants applied when you water. To keep your Purple Shamrock looking and growing its best, fertilize every two to three weeks.
Salts can buildup in the soil after continued fertilizer applications, which can result in burned foliage so the soil requires periodic flushing. Take your container to the sink and allow water to run slowly through the soil for about five minutes.
This should remove the unwanted salts from the soil. Once the container drains, move it back to its indoor location. You will probably only have to flush the soil of the unwanted salts about every four to six months.
Other than to pinch off any dead foliage, especially as the plant goes into dormancy, the pruning requirements for Purple Shamrocks are low to none.
Care Through Dormancy
Do not be surprised if you start noticing the leaves on your Purple Shamrock starting to brown and become dry after several months of growing strongly. This is the plant entering a period of dormancy, which normally happens in summer, and is a chance for the corms to rest and recharge before another period of growth.
Dormancy can be a little unpredictable indoors, and sometimes the plant will have several cycles of strong growth, followed by die back during the year. Dormancy can also be triggered by temperatures higher than 80°F (27°C).
When the foliage starts to turn brown and die back, cut back on watering and allow the affected leaves to dry out, before pruning them off. Move your plant to an area that is cool and dark for 2-4 weeks to allow the plant to rest.
After this, move the pot back to a brighter location. Commence normal watering and fertilize the plant to stimulate new growth and your plant should bounce back stronger than ever.
How To Plant Oxalis Triangularis Bulbs
Purple Shamrock (Oxalis triangularis) bulb just starting to sprout.
I planted three new pots of Oxalis triangulasis bulbs this spring and the process couldn’t be simpler. It only took a few weeks to go from the bulb pictured above, to the full grown plant you saw at the top of this article.
Major tips to remember when potting your Purple Shamrock are:
- Any type of container works well, just be sure the container has bottom drain holes to prevent problems with rot.
- Use a lightweight potting mix that drains well.
- Fill a draining container about three-quarters full of a well-drained potting mix. Water the soil to settle it.
- Place the Purple Shamrock bulbs on top of the soil, spacing several inches apart. I planted three bulbs in the pot in the picture below.
- Cover the bulbs with soil so they are planted about 1 to 1.5 inches deep. Water the container’s soil again and until it runs out the bottom of the pot.
- Place the container is a bright indoor location and you should see new growth appear in around 2-3 weeks. I actually saw growth within a week, but my bulbs were already sprouting when I potted them.
- Make sure to keep the potting mix moist while the bulbs are sprouting, then reduce the watering to when the top inch of potting mix is dry. Err on the side of under watering, as root rot is one of the only major problems with this plant.
Repotting Oxalis Triangularis
The plant only requires repotting every few years to add fresh soil or to create new plants from the additional offsets produced. Move up to a container that is one size larger if you aren’t separating the offsets and are just refreshing the soil.
The best time to repot is in winter during the plant’s dormant stage. Just follow the same instructions as for planting new bulbs.
Propagating New Plants
Oxalis triangularis is propagated by separating the offsets to create additional plants. This is best done while the shamrock is in its dormant stage. Remove the Purple Shamrock from its container and gently pull the bulbs apart. Once separated, you can plant the bulbs in new containers.
Before you consider repotting or separating offsets, make sure to allow the foliage to die naturally and don’t trim it off too soon and while it still has color. The bulbs are still gathering nutrients from the foliage and cutting it off too soon can lead to weaker bulbs that don’t perform as well when replanted.
A healthy Purple Shamrock plant 3 weeks after planting.
I’ve also recorded a video about my experience growing Oxalis triangularis and discussing the care needs of this fantastic plant. Check it out below.
For the most part, Purple Shamrock plants are relatively free of serious disease problems. However, overwatering or growing it in too soggy conditions can cause problems with rot.
When rot is the problem, the underground bulbs turn black and mushy and the entire plant eventually collapses and dies. When this happens, it’s best to just discard the plant and start with a fresh one, watering when the top inch of soil becomes dry and being sure to grow the shamrock in soil that drains well.
The other two problems that can affect Purple Shamrock plants are the fungal diseases powdery mildew and rust. These problems usually occur when temperatures are cool, there is too much humidity and the plant isn’t getting adequate light. Both problems are easy to identify.
- Powdery Mildew: Powdery mildew shows up on the plant as powdery white patches that affect all portions of the shamrock including the blooms. In severe cases, the powdery substance can coat the entire plant.
- Rust: Rust shows up as small, light yellow flecks on the foliage, as well as a white powdery substance covering all portions of the plant.
Most of the time these problems aren’t severe and rarely require treatment, other than moving the plant to a bit warmer and brighter location, if possible and decreasing the amount of humidity. However, if the problem is growing you can spray the Purple Shamrock with a fungicide, repeating as suggested on the product label.
When it comes to possible pests on your indoor Purple Shamrock, the two biggest threats are spider mites and mealybugs. In severe cases of infestation and if left untreated, both pests can kill your Purple Shamrock plant, as well as spread to your other houseplants, so quick treatment is advised. Identifying both pests is easy.
- Mealybugs: Mealybugs show up on the Purple Shamrock as masses of a white cottony substance, which are actually groups of the pests. They suck out the plant’s juices and can weaken or kill it.
- Spider Mites: Spider mites are tiny, sap-sucking insects that spin a fine webbing over the Purple Shamrock. Like mealybugs, an untreated infestation can weaken or kill the plant.
Treat both pests by spraying both sides of the foliage and all other areas of the Purple Shamrock with an insecticidal soap or neem. Repeat the treatment as directed on the product’s label.
Why Are My Purple Shamrock’s Leaves Turning Yellow?
If your Purple Shamrock’s foliage starts yellowing it usually means you are giving the plant too much water. This can be caused by watering too often, growing in soil that doesn’t drain well or you’ve planted in a container that doesn’t have bottom drain holes.
If the soil and container are not the problem, then reduce the frequency of your water applications. During the growing seasons of spring through summer, water when the top inch of soil becomes dry, which will probably be once each week. However, when the Purple Shamrock is dormant in fall and winter cut back watering to about once every two to three weeks.
If you are watering correctly, check the pot for a drain hole and if needed, repot into a proper draining container and use a rich soil blend that drains well.
What Causes White Spots On My Purple Shamrock’s Leaves?
If your Purple Shamrock develops white spots on its leaves, this is generally a sign of two fungal problems powdery mildew or rust. If rust is the problem, there is the addition of tiny light yellow flecks on the leaves too.
Both problems are caused by conditions that are too dark, too cool and there’s too much humidity. You can move the plant to brighter and warmer conditions, as well as cut down on the humidity. In addition, you can spray the entire plant with a fungicide to control the problem.
How Can I Propagate New Oxalis Triangularis Plants?
While the Purple Shamrock is dormant in fall and winter, gently remove it from its container and carefully separate the bulbs. Plant the bulbs in a new container, making sure it has bottom drainage and into a well-drained soil. Space multiple bulbs several inches apart and plant about 1.5 inches deep in the soil.
Is Oxalis Triangularis Toxic To Cats?
The leaves of Purple Shamrock have a bitter taste, which usually prevents cats and dogs from having more than a small taste, however, they contain oxalic acid, which is toxic when large quantities are consumed.
Do Purple Shamrock Leaves Close At Night?
Like the majority of Oxalis types, the leaves of Purple Shamrock close at night and reopen during the daytime hours.
Ask a Master Gardener: Caring for an oxalis (shamrock plant)
Q: I get a St. Patrick’s Day shamrock plant from the grocery store every year, but I seem to kill it within a few months. How can I keep this one alive? Should I plant it outside once it warms up?
A: True shamrocks don’t do very well indoors, so the purple or green plants sold as shamrocks around St. Patrick’s Day are actually another kind of plant called oxalis. Oxalis need bright light and barely damp soil. You may need to water once or twice a week, but don’t let the pot sit in water. If the leaves turn yellow, you are probably overwatering, so back off and see if they improve. Temperatures below the mid-70s will keep it blooming longer.
You might not have been killing your plants; they could have been going dormant. Oxalis rest a couple of times each year. You will know it is nap time when the plant starts to fade. Stop watering once you see that happening. You can remove leaves as they brown, but before then they are needed to collect the energy that the oxalis stores in its underground bulbs. Once it looks pretty dead, put the whole pot in a cool, dry place, preferably a dark one, for two or three months. After that time, move the plant back to a sunny area, start watering again and give it a little fertilizer. If you want to repot it, this is the time.
Some people manage to keep their oxalis alive without letting it go dormant, but that can be hard on the plant and usually results in a plant that no longer blooms.
Even the hardiest varieties of oxalis won’t survive in most of our region, so planting it outside is not recommended.
Written by University of Minnesota Extension Master Gardeners in St. Louis County. Send your questions to [email protected]
Botanical Name: Oxalis regnellii
Purple Shamrock grows in a clump habit of striking purple foliage. Its triangular-shaped leaves fold along the vein and look like butterflies fluttering above slender stems.
Many varieties are available, including ‘Triangularis’ pictured here. Other common names for this plant are False Shamrock and Shamrock Plant.
You can expect an abundance of soft-pink flowers to appear in spring and summer. Dainty, five-petaled blooms rise like trumpets above the mounds of purple, clover-like leaves.
Don’t let its fragile appearance deceive you. This is one of the easiest flowering house plants to grow as long as you can keep it moist and shaded.
Oxalis plants may go dormant if the soil is allowed to dry out or if it’s exposed to hot, direct sun. Don’t worry, it will come back. Just cut off all the leaves and you’ll have a healthy, thriving plant in just a few weeks.
Divide this plant or repot it anytime. Use a pot with drainage holes to prevent soggy soil. If you want to use a decorative pot without drainage holes, use it as a cachepot. Just slip a plain nursery pot into the cachepot. I put pebbles in the bottom of cachepots to keep the plant above the drainage water.
This happy-go-lucky plant seems content to be anywhere. You can grow Purple Shamrock indoors year-round, or move it outside on a shady patio for the summer. It can be planted outdoors in frost-free regions, but it’s fast-spreading and can be invasive in the garden.
Purple Shamrock and Supplies
Purple Shamrock Care Tips
Height: 6-12 in (15-30 cm)
Light: Bright indirect light will give O. regnellii the best leaf color. Leggy, spindly growth is often caused by lack of light. Move the plant to a spot where it will get curtain-filtered light from a south-facing window.
Water: Allow surface of soil to dry between waterings. Don’t allow the potting medium to dry out. Oxalis is sensitive to the salt buildup from fertilizers. You’ll notice it as whitish deposits on the surface of the soil or around the rim of the planter. It’s a good idea to flush the soil occasionally to rid the soil of excess salts, which can harm this plant’s fleshy roots. Flush the pot every month or two by watering plants thoroughly with room-temperate water. Allow the water to drain through the drainage holes for a half-hour. Then flush it again. Empty the drainage tray afterward so that the plant is not sitting in water.
Humidity: This Brazilian native prefers relative humidity around 50% or higher. If indoor air is dry, try one of these easy ways to increase humidity for your plant.
Temperature: Prefers cool temperatures, especially while in bloom; 55-65°F/13-18°C at night/not warmer than 75°F/24°C during the day.
Soil: Any good potting mix
Fertilizer: Feed every 2 weeks while plant is growing with a balanced liquid fertilizer diluted by half. When blooming stops, feed every other month.
Propagation: Divide the plant by gently pulling apart its small, tuberous roots into smaller clumps and potting them in separate containers.
- Houseplants A-Z
Shamrock Plant Disease
Shamrock plants are beautiful delicate plants that are a favorite of many people.
photo credit: audreyjm529 Overall, if given a rest period during the year and watered and fertilized properly the Shamrock will live for many years. If you notice your plant looks a little weak or seems to be suffering there are two plant diseases that affect the shamrock plant.
Fungal Rust can be diagnosed when you notice an obvious orange color on the underside of the leaves. Treatment: I remove the plant from the pot and clean the pot thoroughly. If you feel the plant needs repotted this it the time to do so.
Before placing the plant back in its pot wash the plant carefully with a mix of neem oil. Neem oil is not one of the toxic chemicals that many people use so I feel its safe to use and its good for several other forms of plant diseases too.
After placing the plant back in the pot remove the top layer of soil and replace with fresh soil. Water the plant lightly with a chamomile tea mix. If your plant has really suffered you may want to take extra measures. This site has information on common plant disease
Spider Mites are a common problem on the shamrock plant. These insect parasites are small mites that are almost not visible. They produce a little white webbing that is sticky. They seem to choose to hide and live under leaves and in the joints of stems.
You need to remedy the problem as quickly as possible or they will spread. A spider mite sucks the juice out of the plant and weakens it. If left untreated the plant will slowly die.
If you suspect mites, there are two treatments. A home remedy of water a few drops of dish soap and a touch of garlic will stop the mites. If the mites are quite large touching them with Sea Breeze that is placed on a Q-tip will kill the bug.
You can treat the plant with Bayer Advanced Tree and Shrub Insecticide. Mix this product with water as directed and pour on the soil around the base of the plant. It will kill the bugs within a week or so. The plus to this product is that it provides protection from reinfestation for up to a year.
Note: Make sure you remove any old or infected soil from the top of the pot.
For more information on this plant check Shamrock Plant Care and The Shamrock Plant
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Oxalis houseplant disease
We viewed your photos and the leaves do not look healthy. We cannot say for sure but you may be dealing with a tuber or root issue. They do not like to be overwatered. The roots are shallow and like to be pot bound. At this point, you will have to focus on proper care.
The plant likes bright indirect light during most of the year. It tolerates full sun in winter if actively growing. Daytime temps should be 65-75 degrees F and nighttime temps around 55-60F. More warmth than this will cause the plant to go into dormancy faster. Keep away from drafts.
Keep the soil evenly moist when actively growing. The soil must be well drained to prevent waterlogging. If overwatered, the leaves will brown. Feed with half strength foliage plant food weekly while growing. Remove spent flower sand leaves.
After blooming, the plant goes into a dormant phase. Gradually reduce water and pull off spent leaves. Once the foliage is gone store in a cool dark spot for 1-3 months. When green shoots appear bring the pot back into a sunny window and begin watering and feeding. See more from Penn State https://extension.psu.edu/shamrocks-as-houseplants