How to make mandevilla bloom?

No Mandevilla Flowers: Getting A Mandevilla Plant To Bloom

Vibrant pink blooms and elegant vining stems characterize the mandevilla plant. Getting a mandevilla plant to bloom in tropical to sub-tropical regions relies upon plenty of water and adequate sunshine. In cooler climates, the plant is only suitable for summer outdoor growing and may need a bit more babying as the season is short and the vines need to mature before blooming. There are a few tricks you can try if there are no mandevilla flowers on your plant.

Mandevilla plants need nighttime temperatures of around 60 F. (15 C.) to force blooming. They cannot tolerate cooler temperatures of less than 40 F. (4 C.) and an outright freeze will kill the vine. Northern gardeners who wonder, “Why won’t my mandevilla bloom” may be in for some serious work to encourage this tropical wonder to brighten their landscape.

Why Won’t My Mandevilla Bloom?

Mandevilla are heavy bloomers in the right conditions. You can even prune them to the ground in late winter or early spring, and the plant will grow back quickly and reward you with the astounding blooms on the

new vines.

If there are no mandevilla flowers on your plant, the cause could be cultural, improper site conditions or temperatures that are too cool. Established plants that are mature will provide the best color display, so don’t give up on young plants. They may simply need more time to bring out their flower show.

Cultural Reasons for a Mandevilla Not Flowering

These lovely plants need well drained soil with plenty of humus added. Indoor plants thrive in a mixture of peat, potting soil and fine sand. Potted plants should be fertilized every two weeks with a high phosphorus plant food from spring through summer. Feed outdoor plants with a time release bloom food in early spring. Avoid high nitrogen plant foods, as they fuel leaf and vine growth but do not promote flowers.

Provide a support for the vines so the buds can receive plenty of sunlight. Temperatures cannot be too warm, but situate the plants where there is protection from the searing heat during the hottest part of the day. Keep the fast growing vine deeply watered but not soggy. Following these guidelines will generally prevent a mandevilla not flowering.

Getting a Mandevilla Plant to Bloom

If you followed correct cultural care and siting, there is little reason a mandevilla plant does not bloom. However, in the rare cases where your vine just simply won’t produce, you can force it to flower. Use a teaspoon of Epsom salts dissolved in water once every two weeks for a month. The salt content will build up in the soil if you try this for any longer. The magnesium in the Epsom salts should get it flowering again. In potted plants, leach the soil with plenty of water after trying this treatment.

Additionally, a mandevilla plant does not bloom if it hasn’t been trained correctly. In young plants, pinch off the new growth to promote side shoots. Mandevilla bloom off of new growth so this may be just the trick to get new vines and enhance blooming.

How to Fertilize Mandevilla Plants?

Many people who grow Mandevilla vines want to know about the proper fertilizing routine. What do these beautiful vines need to thrive? Fertilizing Mandevilla plants is not difficult but you need to provide them with all the nutrients they need. This is the only way to make your Mandevilla vine bloom.

Mandevilla Flowering

Mandevilla vines are known for their lush, beautiful flowers. These plants belong to the Periwinkle family of sub-tropical flowering vines and bushes. They need warm temperatures to thrive and produce flowers.

In the US, Mandevillas can grow outdoors in the hardiness zones 9 to 11. However, they cannot grow outside in colder zones, so this is something to keep in mind. You need to know how to care for them in winter and how to provide adequate fertilizing routine to make them produce flowers and bloom the best they can.

Providing proper feeding to your Mandevilla will make it grow healthy and produce gorgeous blooms. Keep in mind that it’s not enough to simply fertilize – you need to understand the needs of your plant and to give it proper nutrients. This is why it’s crucial to choose proper fertilizer and to apply it adequately.

Good fertilizer will also ensure that your Mandevilla grows healthy into the next year. It is therefore important to follow fertilizer guidelines carefully and to give your Mandevilla vine just what it needs.

When to Fertilize Mandevillas?

Mandevillas are dormant in winter so you should never fertilize them during this period of time. You should fertilize your vine during its growing season, which is spring and summer. It is important to give fertilizer to your Mandevilla every two weeks during spring and summer.

It is important to stop fertilizing sometime in the fall, when the weather gets cold and your plant becomes dormant. If you continue applying fertilizer in winter it will make your plant develop new growth, which can be harmed by the cold.

Fertilizing should always follow the increased watering. If your Mandevilla was left indoors during winter you need to introduce it to the sunlight and outdoor conditions before you start fertilizing. Give your vine a chance to acclimate before you introduce fertilizer. Also, make sure that the frost has passed before you move your Mandevilla plant outdoors.

You may take your Mandevilla outside around March (in warmer zones) or April (in cooler zones). If you live in a very cold climate, you may even wait until May to take it outside.

You should start fertilizing in May. Young plants have a bit higher nitrogen ratio so you need to use a Mandevilla fertilizer on them to promote the growth of foliage. Feed your Mandevillas for two weeks and gradually move to balanced food that is intended to promote buds and flowering.

If you have potted Mandevillas, make sure to always use liquid fertilizer. After fertilizing, water your plant fully so the fertilizer can get to the roots and prevent them to burn.

On ground vines, use granulated time-release fertilizer. If you use this one you can apply fertilizer just once per month because the time-release fertilizers work slowly and release nutrients over longer period of time.

What Type of Fertilizer to Use?

Mandevillas need balanced fertilizer that will promote the growth of the plant and make it bloom. They respond well to diluted food you can add to their irrigation water two times per month.

Mandevilla plants benefit from 20-20-20 fertilizer that is also good for many other plant types. It’s advisable to use an organic fertilizer to help protect the environment.

If you wish to promote blooms, give your Mandevilla vine high phosphorus food every 2 to 3 weeks in the beginning of the flowering season. Phosphorus is great for promoting blooming and can help your vine flower.

If you are unsure about the phosphorus content, look at the formula. The middle number refers to phosphorus. Make sure that there is high phosphorus content in the formula. However, make sure not to go overboard – this can burn your plant.

Also, make sure to go back to more balanced fertilizer hallway through the summer. This is the best way to keep your Mandevilla plant strong and healthy.

Photo credit: Fred Ortlip Back yard • 10-14-2014 via photopin (license)

Mandevilla – Large flower plant climber

Have you ever wished you could ‘splash’ colourful flowers all over your garden, as if with a magical paintbrush? Mandevillas can do just that, providing bold, tropical colour and looking fabulous for most of the year with minimal effort.

Mandevilla (sometimes called Dipladenia) is a lush, tropical climber that flowers flamboyantly all year round In warmer climates. Hardy and versatile, it flowers in shades of deep burgundy, scarlet, through all shades of pink and white. It is great in large pots where it can bring an instant lush, tropical look to poolsides and outdoor entertaining areas. Give it a sunny position for best flowering, a rich, well drained soil and plenty of moisture during the growing season. Originating from tropical South America, it loves a Cairns or Brisbane climate but will grow well as far south as Melbourne if given a warm position and shelter from frost. It is likely however, to stop flowering in winter in cooler regions.

Training your mandevilla

The mandevilla is naturally a climber but can be pruned into a compact bush. If untrained, it will grow upward to a certain height and then the long runners will tumble downward like a fountain, so a decision needs to be made whether to train it as a bush or as a climber. Support at the base of the plant by staking it when it is young will help it develop a solid ‘trunk’ and give it a bushy or shrub-like habit. If you want your mandevilla to be a climber, provide it with a trellis or plant it near a fence or pergola and wind the long tendrils onto the structure as it grows.


Tip prune non-climbing plants regularly to promote bushiness. Cut back thoroughly in late winter or spring, when flowering is lightest. Even mandevillas trained as climbing plants will do best if pruned annually.

Mandevillas have a tuberous root system which makes them hardy during dry spells but which also makes them susceptible to root rot in boggy conditions, so make sure they have good drainage and don’t overwater during winter. Apply a generous layer of mulch to conserve water.

Fertilising Mandevillas

Keep mandevillas well fed with an application of Searles Robust in October and again in April. Alternatively, year-round feeds with Searles Flourish — fortnightly in summer, monthly in winter, will keep plants healthy and promote flowering.

Why Does My Mandevilla Plant Not Bloom?

The mandevilla is a beautiful vine with large, trumpet shaped flowers that are enhanced by large, glossy puckered leaves To keep your mandevilla blooming there are a few requirements.


Full sunlight and warmth are necessary to help the plant bloom. However, during extended hot spells the plant will need to be watered daily or, if potted, moved into a shady area.


During the growing season your mandevilla will require a high phosphorous (10-20-10) fertilizer every two weeks to encourage blooming. All leaves and no flowers indicate a high nitrogen content


The mandevilla should be planted in a well-draining soil. Allow the soil to dry out before watering. The plant is sensitive to over watering.


Besides the need for well draining soil, the mandevilla needs enough soil. If planted in a container it should have at least 8 to 12 inches of soil. It does not need to be root bound to bloom.


A sun lover, a mandevilla likes it warm and mildly humid. It is a tropical plant. If the temperatures drop below 65 degrees for any period of time, blooming will stop.


June 2, 2018

I am looking for recommendations for a hanging potted plant to place on our front porch eve. We have had ferns, succulents and flowering arrangements, but they do not last the summer. They face the west as the sun rises at high noon and later descending to the extreme west.

I am not surprised by your lack of success with ferns or succulents, as ferns prefer shade, and succulents actually like morning sun and afternoon shade. I would consider using a tropical—a nice one for a hanging basket would be either mandevilla or bougainvillea. They will thrive in hot, humid weather and love full sun. Another option would be lantana or portulaca. I assume you water, and as long as they don’t totally dry out and you fertilize periodically, any of these should give you great color all summer.

October 2010

I have a Mandevilla in a pot which got quite tall and is still blooming on a trellis. I have heard you say that they need to be cut to release them from trellis before moving them indoors. Does that mean I should do the same or cut back more because it is in a pot? I will be storing it in the garage for the winter. Does it need light and water throughout the winter?

Typically mandevilla vines are quite prolific during the growing season. Many plants, even those grown in containers, are usually entwined in a fence or trellis of some sort, so cutting is necessary to release them to make the move indoors. Cut as little as possible when you move them, since there will be some natural decline in the garage. Unless your garage is warm, they need very little care for the winter months. The goal is to keep them from freezing, not keep them actively growing. They won’t look perky when you move them back outdoors next spring, but prune them hard then, repot, water and fertilizer and they should rebound.

July 2005

I have a Mandevilla in a container that is doing so well. If I plant it in the ground will it survive our winters?

Mandevilla is a tropical flowering vine that will not survive even a heavy frost, much less the whole winter. If you want to carry it over for another season, take the plant indoors in October. It can be stored under the house, or treated as a houseplant for the winter.

September 2007

I bought a Mandevilla last spring for the first time. In the past you have told us in the newspaper how to winterize it, but since I didn’t have one, I didn’t read your words of wisdom very carefully. I planted it in the ground and it has spread its vines on my lattice in the flower bed. What do I need to do to try to preserve it? Should I cut it back after a frost or do it sooner? After cutting it back, should I cover it with mulch and keep my fingers crossed, or should I did it up and put it under the house for the winter? When should I do all this?

Regardless of how much mulch you use, mandevilla will not over-winter outdoors. If you want to preserve the plant, cut it as little as possible to detach it from the trellis and pot it up. Store the plant under your house for the winter, or indoors. When you move it back outside it is not going to look perky. Spring is the time to cut it back. That is also when you can replant it in the ground if you choose, or grow it in a container. Start fertilizing and watering when you move it back outside and it should recover. If you choose to protect it for the winter, you need to lift and store before a killing frost. If you plan to pot it up and bring it inside your house for the winter, you need to do this by early October. If you are storing it under the house, as long as you beat a freeze you should be ok.

October 2006

Soon I will be pruning my mandevilla and placing it in my greenhouse. Would you tell me what part of the vine to use to start new plants? How should I water and fertilize? Also, the mandevilla that is three years old did not bloom very well this summer. It is in partial shade. I fertilize with slow release fertilizer and Miracle Gro once a week. I water every other day.

First of all, mandevilla plants like full sun. If it is not getting at least six to eight hours of sunlight a day, it won’t bloom well. It also blooms on the new growth, so if the plant is large and well established and not growing much, that can also reduce blooming. Prune hard before moving it back outdoors, and consider repotting then as well. Mandevilla plants can be grown from cuttings. The parts you trim off in your pruning now could be used. Make sure each cutting is no longer than 3- 4 inches in length. You may want to use a rooting hormone on the cut end. Even in a greenhouse, you may want to keep the cuttings in a closed system to keep the humidity high and prevent the potting medium from drying out. If you are lucky enough to have a mist bed, don’t worry about it, but many hobby greenhouses don’t have that. A closed system is the pot inside a plastic bag. You could make a larger chamber since you do have a greenhouse. No fertilization until well rooted and growing. The soil should be moist but not waterlogged.

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Mandevilla also know as Rocktrumpet belongs to the dogbane family of plants and its name was made official in 1840. This plant has many uses including being used as a vine. One popular use of the Mandevilla is in pots and around walkways. They offer beautiful blooms in spring through fall and tolerate the full sun well. When planted in pots and container gardens, these shrubs will add dramatic color and beautiful textures. Planting near waterfalls, ponds, and pools brightens up the landscape and these will climb up walls with the support of a trellis.

You can grow Mandevilla nearly anywhere, full sun is best and an area where they will get plenty of moisture. This is a sub-tropical plant and needs to be protected in the cooldest of winters. Caring is very easy for these plants as well. Minimal pruning after the flowering season is over is recommended but these can be trimmed any time of year to maintain them to their area. Like any plant, Mandevellia will need to be fed regularly with Moon Dust and Super Charged Moon Juice monthly to keep the roots healthy and plant ready to bloom.

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