Mandevilla will show signs of renewed growth in spring.
Use regular liquid fertilizer for flowering Mandevilla, which is added to the watering water, or a slow-release fertilizer that is mixed with the potting soil when planting. This helps the Mandevilla to grow and form flowers.
Try to keep the soil moist, but not too wet. If the outside temperatures are above 55˚F, the Mandevilla can be put outside for another summer full of beautiful flowers.
When to Fertilize Mandevilla
The Mandevilla plant is dormant in winter, so you should never fertilize it during this time. You should fertilize your vine during its growing season, i.e. in spring and summer. It is essential to fertilize your Mandevillas every two weeks in spring and summer.
Remember to stop fertilizing sometime in autumn when the weather gets cold and your Mandevilla goes into a dormant state. If you continue fertilizing in winter, your Mandevilla will develop new growth that can be affected by the cold.
Fertilization should always follow increased watering. If your Mandevilla has been left indoors in winter, you must familiarize it with sunlight and outdoor conditions before fertilizing. Give your vine a chance to acclimatize before you start fertilizing. Also make sure that the frost is over before taking your Mandevilla outside.
You can bring your Mandevilla outdoors around March (in warmer areas) or April (in cooler areas). If you live in a very cold climate, you can even wait until May to bring it outside.
Start fertilizing in May. Fresh Mandevilla has a slightly higher nitrogen ratio, so you will need to fertilize them with a Mandevilla fertilizer to encourage leaf growth. Give your Mandevillas a two-week diet and gradually change to a balanced diet to encourage buds and flowering.
When you pot Mandevillas, make sure that you always use liquid fertilizers. When you have finished fertilizing your Mandevilla, water it completely so that the fertilizer reaches the roots and does not burn them.
For ground vines, use a granulated slow-release fertilizer. If you use this, you can only apply fertilizer once a month, as the slow-release fertilizers work slowly and release nutrients over a longer period of time.
What Type of Fertilizer to Use
A balanced fertilizer is needed to stimulate the growth of the Mandevilla and make it bloom. Mandevilla responds well to diluted food, which you can add to your irrigation water twice a month.
The Mandevilla plants benefit from 20-20-20 fertilizers, which is also good for many other plant species. It is wise to use organic fertilizer to protect the environment.
In order to encourage flowering, give your Mandevilla vine high phosphorus food every 2 to 3 weeks at the beginning of flowering. This is a very good way to encourage flowering and can help your vine to flower.
In case you are unsure about the phosphorus content, take a look at the formula. The average number refers to phosphorus. Take care that the formula has a high phosphorus content. However, be careful not to go overboard – this can burn your Mandevilla.
Make sure that you also return to a more balanced fertilizer corridor during the summer. The best way to keep your Mandevilla plant strong and healthy.
Mandevilla Fertilize Rate
Fertilizers, both balanced and flowering, should be used sparingly to avoid damage to the roots of the Mandevilla vine. Mix 1/2 teaspoon of fertilizer in 1 gallon of distilled water and replace one watering a week with the solution.
The Mandevilla vines grown in bright light need slightly more nutrients, so the amount of fertilizer needs to be increased by half during flowering, while vines are grown in low light or light shade need only half as much fertilizer.
Before applying fertilizer, always moisten the surrounding soil to limit the risk of root burns and salt deposits and to avoid spraying the solution on the vine’s stems and leaves.
Tips and Actions
Despite the fact that fertilizer helps the Mandevilla vines, overfeeding can have profound and negative effects on them. Burned leaves, stunted growth, and leaf fall are signs of overfeeding, as is the formation of a lime-white crust on the soil surface of potted Mandevilla.
If you see symptoms, stop feeding and leach the soil to remove excess soluble salts and nutrients. Keep water running at the base of the vine for 5 to 10 minutes or rinse potted Mandevilla with a quantity of water equal to twice the volume of the pot.
Dead or damaged growth should be cut away and feeding should be resumed the following year after the vine has a chance to recover.
Mandevilla Fertilizer Video
Mandevilla is a voluble tropical perennial grown as an ornamental for its pink, white, red or yellow flowers.
Native to Brazil, it is part of the Apocynaceae family, like oleander or periwinkle, with which it has in common the generosity of flowering.
Mandevilla plants benefit from 20-20-20 fertilizer, which is also good for many other plant species. It is recommended to use organic fertilizer to protect the environment.
To promote flowering, feed your Mandevilla vine with high phosphorus levels every 2 to 3 weeks at the beginning of flowering.