How often water rosemary?

Oh yes siree, rosemary is wonderful! It’s a woody perennial evergreen herb that’s commonly sold as a shrub and is a member of the mint family. This is such an attractive plant to have in the garden and comes in a few forms, many sizes and is versatile and easy. Here’s what you should know about growing rosemary.

The Rosemary “Tuscan Blue” was 1 of the anchor plants in my front garden in Santa Barbara – it grew to 6′ tall by 9′ wide. Now that’s 1 big herb! I moved to Arizona a couple of months ago and just had to do a video and post on this ginormous plant before I left. It’s 1 of the largest rosemarys that I’ve ever seen so how could I not?

The forms that it comes in are upright, ground cover or trailing and a combo of the 2. The most commonly sold upright rosemarys are Tuscan Blue (which is mine), Tuscan Spires, Golden Rain (I also have this 1) and Miss Jessup. A few of the trailers include Irene, Huntington Blue and Prostratus (which is the commonly sold trailing rosemary). The crosses, which have growth habits of both upright and trailing which some refer to as “semi trailing”, are Collingwood Ingram, Ken Taylor and Boule.

Rosemary, like Aloe vera, is a plant with purpose. Its pungently scented foliage, which is like a wake up call when inhaled, has many uses. It’s beneficial both internally and externally and is frequently enjoyed in the culinary trade – professional and home chefs use it in many ways. The 2 favored for taste are “Tuscan Blue” and “Tuscan Spires”. I prefer to use the tender new growth for cooking.

This is Rosmarinus officinalis “Ken Taylor” – it both grows upright & trails.

Here’s what you need to know about growing rosemary:

Exposure: Rosemary does best in full sun. It can take morning shade but needs that midday & afternoon sun to look its best. It also requires good air circulation.

Cold Hardiness: Rosemary will show damage if the temps dip below 20 degrees F. You can always bring your plant in for the winter months – see more on growing rosemary indoors further on down.

Water: It needs regular waterings to get established. After then, infrequent & deep waterings (every 2-4 weeks depending on your climate) are fine. Good to know: be careful not to over water your rosemary because this plant is subject to root rot.

Soil: Make sure the soil drains really well. What you add to amend drainage (if you need to) varies depending on your soil type. I added loam to my gardens. In a pot, succulent & cactus mix would be fine as well as potting soil; the latter you’d need to water less often. Rosemary isn’t particularly fussy as to soil type but I will say that it prefers a soil more on the alkaline side rather than acidic.

You can see my ginormous rosemary on the right – it grows behind & around my succulents.

Fertilizer: Rosemary doesn’t require much if any at all. I’ve never fertilized but have composted them, every 1-3 years. If your rosemary is looking a bit yellow & pale, you could feed it once in spring with something like this.

Propagation: Propagating rosemary is easy. I take cuttings about 5-8″ long (not the tender new growth at the ends but not the old woody growth either), strip off the lower leaves & put them in water. Make sure 2 or 3 of the bottom nodes are in the water because that’s where the roots come out of. When they put out substantial root growth, I plant them into that loose mix.

Pruning: I would give this rosemary a really good pruning every spring after flowering. Because it grows so big, I needed to saw out whole branches to give it a better shape. Also, as those big branches grew, they would get heavy. I removed branches that were crossing over. Throughout the year I’d give it a light pruning to keep it in check. Depending on the size & shape of yours, you may only need to prune it when harvesting those fragrant tips.

Pests: I’ve never seen it with any except for a little spittlebug in the San Francisco Bay Area which I just hosed off. I’ve read that it’s also susceptible to spider mites, mealy bugs & scale.

Flowers: Oh yes it does! My “Tuscan Blue” has beautiful blue flowers which are abundant in the winter & spring. Then, it would bloom off & on but not as heavy. The bees love the flowers! Rosemary flowers are usually blue but different varieties can have white, pink & lavender/purple blooms. Good to know: in order to get your rosemary to flower, it needs full sun.

The flowers of Rosmarinus officinalis “Tuscan Blue” – lovely to look at & a magnet for bees.

Uses: Rosemary has so many uses in the landscape. It does great in containers & is very suitable to prune into topiary forms. Rosemary grows along the coast, in rock gardens, on banks as a ground cover, trailing over walls, as a hedge & of course in herb gardens. Good to know: rosemary is deer resistant.

Indoors: Simply put, growing rosemary indoors can be a bit of a crapshoot. You want to make sure it has as much natural light as possible – high light. And, be sure not to overwater it & be certain that all the water thoroughly drains out of the pot (make sure that there is a drain hole(s) & that it is not clogged. In the cooler, darker months, you’ll want to water it even less. Take it outside in the summer months if you can because it’ll love the sun & heat.

To sum it all up, here are the 3 most important things that you need to know to grow rosemary: it needs full sun, well-drained soil & not to be over-watered.

I did a video many moons ago about how I used that rosemary which you might find interesting. Rosemary is a plant I absolutely love and it tickles my fancy that there’s some growing right outside my patio wall. Time to go out and pick a bunch of it right now to bring into the house. Ahhhh …. that fragrance is like none other!

Happy gardening,

This is Rosmarinus officinalis “prostratus” (or trailing rosemary) grows alongside the wash behind my house in Tucson, AZ. It gets no supplemental water & the summer temps have consistently been 100 degrees F plus. It doesn’t look too worse for wear!

It is tempting to say there aren’t any rules for Rosemary. It is that easy to grow. Like most Mediterranean plants, Rosemary likes to be high and dry. If you plant it in the garden, choose a location with all day sun and a soil rich in organic compost that drains well. If you have wet summers, try raising your Rosemary plants up off the ground, which will help to reduce humidity and increase drainage. Also, don’t crowd your Rosemary plants. With a few exceptions they are large plants and need space. This is especially important if you have humid summers, because it allows air to move more freely around the plant. If your soil is rich in organic matter, you should never need to fertilize. If your Rosemary is already planted and you want to improve the soil, layer compost three to four inches around the base of the Rosemary plant and do it often. Very small plants should not be mulched right up to their bases; a three inch air space of bare ground around the little Rosemary plant will keep it from becoming composted. If you spray no harmful chemicals and use only organic fertilizers, the critters at ground level and below will take your compost to the Rosemary plant’s roots and nourish the plants and the soil.

Rosemary plants can be left to grow without pruning which provides a wild naturalized look or they can be pruned to almost any shape. In fact, Rosemary is often used to make topiaries. Be sure to prune your Rosemary plants right after they have bloomed. As new growth occurs, flower buds for the next year are already being set. Late season pruning of Rosemary stems will cause a decrease in the number of flowers. When plants are small, it might be tempting to prune them hard. As they get bigger the folly of this becomes apparent. As with any plant, dead stems or stems that are in your way, can be pruned at anytime. We have pruned Rosemary in almost every season with no detriment to the Rosemary plant itself (other than the decrease in bloom mentioned above).

If Rosemary has an Achilles heel, it would be temperature. Ours have done well as temperatures plunge into the teens and even for a brief time at 5 degrees. Most Rosemary varieties are rated to take 10 degrees. Arp Rosemary and Madeline Hill Rosemary can take up to minus 15. Where the winters are below minus 15 then you either must bring your Rosemary in or treat it as an annual. If you want to over winter your Rosemary plants in the house, grow them as container plants outside after danger of frost and then bring them in before temperatures go below 15. Rosemary planted in containers can get colder than Rosemary planted in the ground.

Container grown Rosemary should be planted in a good potting mix with sufficient texture to allow large air spaces in the soil. Adding 25 to 30 percent perlite and an all purpose organic fertilizer to the soil mix at planting is preferred. A three inch pot of Rosemary should be placed into at least a gallon of soil. We do not recommend combining Rosemary with other herbs unless you have a really big pot. Planting perennial herbs together can make it difficult to repot when the plants are root bound. Each spring, after danger of frost, move your Rosemary to a larger pot or root prune and refill the container with fresh soil. Bring your Rosemary pot in before the first frost and give it as much light as possible. Be careful not to let it get too close to ice cold window panes. Fluorescent lighting can be used by placing the lights about three inches above the tops of the Rosemary plants and leaving the lights on for about 14 hours. Watch the water. Only water when the soil is dry. Use either a water meter or a pencil to test the soil before you water. Insert your pencil as far into the soil near the Rosemary roots as it will go. If it comes out with just a few crumbs, then go ahead and water. Don’t let the pot sit in a saucer with water and use room temperature water to avoid shocking the plant. In the spring after danger of frost has passed, move your pot of Rosemary outside by gradually exposing it to the outdoors. Place the container in a sunny location and give it a few more hours of sunlight each day.

Salvia rosmarinus (formerly Rosmarinus officinalis)

It’s official. Rosemary has been stripped of its own genus.

As of 2017, thanks to botanical DNA testing, its taxonomy has changed – but not much else.

It’s still the same beloved, fragrant herb with a bittersweet, piney flavor. It still makes an outstanding, aromatic ornamental. And its striking form and pretty flowers are just as easy to grow and maintain as before.

The family tree has been shaken up a bit, along with a few other close relatives. No longer a stand-alone, this trans-genera herb is now known as Salvia rosmarinus.

But regardless of what it’s officially called, rosemary is still one of the most rewarding plants to grow in the garden.

So, join us now for a closer look at how to grow and care for this classic garden herb!

Why the Name Change?

Since 1753 when Carl Linnaeus published “Species Plantarum” up until 2017, rosemary had the Latin name Rosmarinus officinalis, and belonged to its very own genus.

Photo by Lorna Kring

But in a phylogenetic study published in 2017, Bryan T. Drew and coauthors found that the herbal favorite has several closely related cousins – all of them in the salvia family. Phylogenetics is the study of the evolution and diversification of a species.

DNA sequencing revealed that the genera Salvia, Rosmarinus, Dorystaechas, Meriandra, Perovskia, and Zhumeria were all equally related. And the authors urged embedding these small species into a single broad genus of Salvia.

In November 2019, the RHS (Royal Horticultural Society) tweeted: “We’re adopting a change in the scientific name for rosemary after research has shown that is in fact a salvia.”

This name change appears in the later editions of the RHS Plant Finder – known as the premier guide to cultivated UK garden plants. And nurseries will be relabeling plant stock from 2020 on.

The old genus Rosmarinus is gone, and R. officinalis is now listed as a synonym for S. rosmarinus. In botanical terms, a synonym refers to a superseded name.

However, because the salvia genus already had an “officinalis” (S. officinalis is common or kitchen sage), rosemary couldn’t have the same tag. But the name change doesn’t alter any of its purported healing or medicinal properties – even if it’s no longer officially an officinalis!

And the good news is, the common name, rosemary, remains unchanged.

What Is Rosemary?

S. rosmarinus is an aromatic perennial in the Lamiaceae family, a multi-branched woody herb native to the rocky sea cliffs of the Mediterranean basin. Depending on the species, growth can be clumping, creeping, or upright.

Photo by Lorna Kring

An evergreen, its leaves are narrow and lance-shaped with slightly rolled margins and measure about an inch long.

Slow growing in its first year or two, it reaches a height of 4-6 feet tall with a spread of 6-8 feet at maturity, depending on the variety.

Whorls of tiny blue, white, pink, or mauve flowers appear in late winter through to late spring, covering stems in a striking early-season display. Plants often give a second, lighter flush of blooms that begin in late summer and can last through fall and winter.

Historically, plants are hardy to USDA Hardiness Zone 9, but new cold-hardy cultivars can grow reliably in regions as cool as Zone 6.

Cultivation and History

The name rosmarinus comes from the Latin ros marinum which means “dew of the sea” – aptly named for its easy growth in the seaside cliffs and rocky slopes of its original habitats.

Photo by Lorna Kring

Steeped in myth and tradition, this beloved herb has been used throughout antiquity in both savory and sweet foods. And its aromatic essential oils were used by ancient cultures such as the Greeks and Egyptians to make perfumes and sweet-smelling incense.

In ancient Greece, it was thought to improve memory and to uplift the spirits. And some Greek students today still burn rosemary the night before exams to help with recall.

According to legend, rosemary’s volatile oils were first distilled in Arabia. Knowledge of distilling was brought to Spain at the start of the 14th century by a Muslim physician, and its essential oils were quickly embraced by apothecarists of the day.

The plant and oil were used to soothe a variety of complaints from anxiety to skin problems, and in 17th century London, it was burned indoors to ward off the plague.

With an intense, cleansing fragrance, its essential oils are still popular today in aromatherapy, perfumes, lotions, and toiletries. Dried needles and flowers are favored in linen sachets and potpourri.

The main constituents of its essential oils, 1,8-cineole, camphor, and a-pinene, have numerous therapeutic applications and are often found in natural dental health products, such as mouthwash and toothpaste.

Some studies have shown that 1,8-cineole can have therapeutic benefits for those suffering from respiratory diseases such as asthma and COPD.

And its abundant flowers provide an important food source for early pollinators and cold weather hummingbirds.


Propagation is most easily achieved from seeds or stem cuttings.

From Seed

Seeds are notoriously slow to germinate and have only a 50 percent success rate. Plus, they can take up to 3 months to sprout if conditions aren’t ideal – always remember to plant at least twice as many seeds as you want plants.

Photo by Lorna Kring

Collect seeds in summer after the pods have dried but before they split and the seeds disperse. Or purchase seeds online (see our recommendations below) or from your favorite garden center.

In mid- to late winter, sow seeds indoors in trays of sterilized starting mix, barely covering the seeds with soil.

Keep the soil moist and provide bottom heat to ensure the optimal soil temperature of 80-90°F is maintained.Heat mats can be purchased online from Grower’s House.

Hydrofarm Heat Mat

This thick and durable mat from Hydrofarm warms the soil 10-20°F above ambient temperatures – crucial for these fussy seeds to sprout. This particular model is the only heat mat with UL (and CE) certification.

Once they’ve germinated, seedlings are at high risk of damping off, so regulate watering carefully – maintain moisture but don’t let the soil become waterlogged. Use a spray bottle to mist seedlings when the top of the soil dries out.

Provide bright light for 6-8 hours a day and ensure plants have free-flowing air circulation.

Wait until seedlings are well established, about 3 to 4 inches tall, before transplanting to individual containers.

Keep plants in containers for their first winter, protected from cold weather, and plant out the following spring after the danger of frost has passed.

From Stem Cuttings

After they have finished flowering, collect 6- to 8-inch stem cuttings from old wood (they’ll have new growth at the tips).

Photo by Lorna Kring

Remove leaves from the lower half and dip the cut ends in a powdered rooting hormone.

Plant 3 or 4 stems in 6-inch pots filled with well-draining garden soil.

Water well and set in a sheltered spot outdoors that gets morning sun.

Provide moderate moisture and allow pots to remain in place until the next spring, then plant out into the garden or larger containers.

How to Grow

S. rosmarinus requires a full-sun exposure in a well-drained location, with soil of average fertility and a neutral or slightly alkaline composition of pH 6.0-7.8.

Photo by Lorna Kring

Create planting sites as deep as the root ball and twice as wide.

Amend the soil with 1/3 organic matter such as compost or aged manure and 1/3 coarse sand or fine grit to improve drainage.

Set seedlings in place and backfill, gently firming the soil over the roots.

Water in well to settle. Provide moderate moisture throughout the growing season, watering only when the top inch of soil is dry.

A top dressing of organic material or an application of an all-purpose fertilizer (NPK 10-10-10) in the spring is all that’s needed to supply enough nutrients.

To keep plants compact, prune them after flowering, in late spring to midsummer, by removing up to 1/3 of their overall growth.

Avoid pruning in late autumn or winter, as this tender perennial needs time to harden off if it’s to survive freezing temperatures in winter.

Apply a thick, 4- to 6-inch layer of mulch over the roots in cold regions to prevent freezing. Learn more about protecting rosemary in winter here.

Growing Tips

  • Propagation is easiest from stem cuttings.
  • Needs excellent drainage to prevent root rot. Amend soil with sand or grit to improve drainage.
  • Prefers soil of average fertility – a single feeding in spring is adequate for its needs.
  • Does best in full sun.
  • Requires only moderate watering.
  • Pick stem tips in the afternoon for best flavor and fragrance.

Containers and Growing Indoors

With minimal care, this bushy herb will grow with abandon once established – often growing 12-16 inches in one summer.

Photo by Lorna Kring

But in containers, plants can quickly become rootbound and lose their vigor – resulting in slow and stunted growth. To ensure the most tender, flavorful leaves for your kitchen garden, replace container plants every 2-3 years with fresh ones.

Ensure containers and soil have excellent drainage and water moderately, or when the top inch of soil is dry, but avoid letting soil dry out completely.

In spring, apply a top dressing of compost or feed with an all-purpose, 10-10-10 fertilizer.

If your containers need to come indoors for winter, place them in a cool room with a south facing window – they need a minimum of 6-8 hours of bright light daily.

Ensure plants have flowing air circulation to reduce humidity and prevent powdery mildew. If you need to, use a fan on the lowest setting for a couple hours a day.

Cultivars to Select

With its fragrance, profusion of tiny flowers, full shape, and robust growth, rosemary’s many cultivars make useful and handsome ornamentals as well as supplying the kitchen.

There are two main varieties, upright and creeping, both of which are highly fragrant. Uprights are better suited for hedges, topiary, and specimen plants, while the creepers are good for ground covers, spilling over walls, or to add stability to slopes.

Dwarf cultivars have a mounded habit and are ideal for borders, containers, or rockeries. And they’re a good choice to train and trim as bonsai or into topiary.

S. rosmarinus

For folks who have the patience to grow rosemary from seed, True Leaf Market offers two sizes of seed packets. Remember to plant at least twice as many seeds as the number of plants you want for best results.


‘Prostratus’ is a creeping variety that adds draping beauty to containers and rockeries, or flowing over low walls.


Plants are available in 3-packs from Burpee.

Chef’s Choice

‘Chef’s Choice’ is a compact, mounded variety that is hardy in Zones 7-10. With a mature height of only 12 to 18 inches, it’s perfect for the kitchen garden.

‘Chef’s Choice’

Plants are available online from Home Depot.

Tuscan Blue

For a traditional, upright plant, the popular ‘Tuscan Blue’ offers dense, multi-branched growth up to 6 feet tall. Ideal for hedges or as a specimen, it’s hardy to Zone 8.

‘Tuscan Blue’

Sets of three plants are available from Burpee.


For outstanding cold hardiness, ‘Arp’ is the variety of choice. Hardy in Zones 6-10, it grows up to 5 feet tall in an erect, dense form.


Sets of three plants can be purchased from Burpee.

Managing Pests and Disease

Rosemary is relatively pest and disease free, although there are a few problems to watch for.

Root rot is the most common problem, because these plants can’t abide having their roots in wet or soggy conditions. Add coarse sand or grit to the soil to ensure water drains freely.

Powdery mildew can attack in crowded or damp conditions and is particularly apt to appear on indoor potted plants. Remove any infected stems and dispose of them in the garbage. Avoid overwatering and ensure plants are well-spaced with proper air circulation.

Aphids and spittle bugs are the most common pests. These insects can be quickly dispatched with a strong blast of water from the garden hose.

Companion Planting

This garden stalwart also makes an excellent companion plant, as few pests find its intense flavor and fragrance palatable.

Beans, carrots, and cruciferous veggies benefit from having rosemary nearby as its intense volatile oils repel cabbage moths (loopers), carrot rust flies, and Mexican bean beetles. Slugs and snails are also deterred from snacking on leafy greens with rosemary growing close by.

It attracts pollinators such as bees, butterflies, and hummingbirds, and is resistant to wildlife like deer and rabbits.


Like most herbs, rosemary’s flavor peaks just before flowering – but leaves can be harvested year-round.

For the best flavor, pick stems in the morning after the dew dries and before the afternoon heat sets in.

Choose tender tips, and with sharp garden pruners, cut stems 6 to 8 inches long.

Photo by Lorna Kring

Use fresh from the garden, or store in the refrigerator in a small glass of water for up to 10 days.

To remove leaves from the stems, hold the tip of one firmly with one hand. Grip the stem an inch below the tip with the thumb and forefinger of your free hand, and firmly pull your fingers down the stem, removing the leaves in one swift motion.


Drying and freezing are the best methods of preserving rosemary.

To air dry, hang single stems or small bundles in a warm, dry area out of direct sunlight. Or dry the stems in a single layer in your food dehydrator set to the lowest setting, or 95°F. This can take up to 8-10 hours, depending on the ambient humidity.

Once dry, remove leaves and store in tightly sealed containers in a cool, dark cupboard. They should stay fresh for a year or more.

Use leaves whole or grind with a mortar and pestle prior to use.

Leaves can also be frozen in ice cube trays half-filled with olive oil or water. Or simply roll up washed and dried stems in freezer bags, squeezing out excess air from the top before sealing, and pop them in the freezer.

Recipes and Cooking Ideas

This classic herb has long been used to season meats such as lamb, pork, veal, and in stews, and it’s a natural with poultry and fish as well.

Photo by Lorna Kring

Rosemary’s delicious pinewood flavors are also liberally used in breads, compound butters, dressings, jam, stuffing, vegetable dishes, and vinaigrettes. And it’s one of the essential ingredients in the popular blend, Herbes de Provence.

The leaves, or needles, give their best flavor when used fresh, but dried and frozen are good options for cooking as well.

Add a chunk of dried wood or fresh green stems to the barbecue for a sweetly savory addition to grilled foods.

You can read more about how to use this fascinating and healthful herb .

Photo by Felicia Lim

For a feast of garden-fresh carrots, this recipe for roasted carrots from Foodal is a must-make!

Or maybe you prefer something sweet? Try some rosemary butter cookies for a sweet’n’savory taste sensation, also on Foodal.

Best Garden Uses

Rosemary is well-suited for multiple settings. It works well as a companion in veggie patches, in containers, as ground cover, in kitchen and perennial beds, on stabilizing slopes, and spilling from window boxes.

Use prostrate varieties for creeping, spilling, and sprawling and uprights as stand-alones or specimen plants.

And dwarf or compact varieties give the best option for containers or bonsai.

The stems, with or without flowers, add long-lasting fragrance and evergreen beauty to cut flower arrangements and winter vases as well as door swags and wreaths.

Quick Reference Growing Guide

Plant Type: Evergreen subshrub Tolerance: Drought, heat, salt spray, wind
Native To: Mediterranean basin Water Needs: Moderate
Hardiness (USDA Zone): Zone 9; some cultivars to Zone 6 Maintenance: Low
Season: Year-round Soil Type: Average
Exposure: Full sun Soil pH: Neutral to slightly alkaline, pH 6-7.8
Time to Maturity: 6-12 months Soil Drainage: Excellent
Spacing: 24-36 inches Companion Planting: Beans, cabbage, carrots, sage
Planting Depth: As deep as root ball Family: Lamiaceae
Height: 4-6 feet Genus: Salvia
Spread: 6-8 feet Species: S. rosmarinus
Pests & Diseases: Aphids, spittlebugs, powdery mildew, root rot

Flavor, Fragrance, and So Much More

With fantastic flavor, superb fragrance, and versatile in the garden and home, you’ll love rosemary’s full-bodied performance and its easy-care requirements.

Remember that it requires full sunlight and excellent drainage. Prune it a bit after flowering, and after that, this easy plant practically looks after itself!

If you’re new to growing this classic kitchen herb, make it easy and purchase plants. Wait to try starting from seeds until you have established plants to take cuttings from.

Do you folks have any favorite tips for growing this herb in the garden? Drop us a line in the comments below.

And if you enjoyed learning about growing this evergreen herb, you might enjoy these growing guides as well:

  • How to Grow Winter Savory
  • How to Grow and Use Lemon Balm
  • How to Grow Bee Balm: Bring Out the Hummingbirds!


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Photos by Lorna Kring and Felicia Lim © Ask the Experts, LLC. ALL RIGHTS RESERVED. See our TOS for more details. Originally published on August 12, 2017. Last updated: January 10, 2020 at 12:04 pm. Product photos via Burpee, Grower’s House, Home Depot, and True Leaf Market. Uncredited photos: .

The staff at Gardener’s Path are not medical professionals and this article should not be construed as medical advice intended to assess, diagnose, prescribe, or promise cure. Gardener’s Path and Ask the Experts, LLC assume no liability for the use or misuse of the material presented above. Always consult with a medical professional before changing your diet or using plant-based remedies or supplements for health and wellness.

About Lorna Kring

A writer, artist, and entrepreneur, Lorna is also a long-time gardener who got hooked on organic and natural gardening methods at an early age. These days, her vegetable garden is smaller to make room for decorative landscapes filled with color, fragrance, art, and hidden treasures. Cultivating and designing the ideal garden spot is one of her favorite activities – especially for gathering with family and friends for good times and good food (straight from the garden, of course)!

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