Dipladenia (dy-pla-DEE-nee-uh) the rocktrumpet or Brazilian jasmine is an older classification for plants now commonly falling under the genus Mandevilla.
The difference between Dipladenia and Mandevilla is in their growth habit.
The spring favorite Mandevilla vine has a vertical growth habit. The Dipladenia plant is a bushy plant with downward, hanging growth.
Dipladenia is an evergreen, flowering plant and a member of the Apocynaceae family (Dogbane).
These flowering tropical vines originate from Brazil – specifically Rio de Janerio and is found in South and Central America, Southwest United States, West Indies, and Mexico.
The most popular species is Dipladenia sanderi (Mandevilla sanderi). It is a woody climbing plant with shiny, opposite, elliptic leaves, trumpet-shaped flowers, pink with orange throat.
The bright, colorful appearance and attractive growth habit make the Dipladenia plants an ideal choice for your garden or as a houseplant.
Dipladenia Plant Care
Size and Growth
Due to its tropical nature, it can flower for most of the year even in cooler areas.
But it will have a shorter flowering period in such temperatures.
Dipladenia, has an upwards growth to a certain level after which it droops over the side of pots or hanging baskets and begins to trail downwards.
You can train your plant to have a bushy growth by giving the plant support at the base and pinching out new growth.
Encourage the climbing growth habit by winding the plant around a taller structure like a trellis as it grows.
Dipladenia is a hardy plant and recommended for USDA hardiness zones 10 to 12. It can also be overwintered indoors.
Flowering and Fragrance
Dipladenia plants are bushy plants characterized by small, pointy leaves with a slight, gloss-like sheen to them and are a shade of deep green.
It also has smaller, tube-shaped flowers in comparison to Mandevilla flowers that blooms in a number of different colors ranging from pink and red to orange with a soft fragrance.
Light and Temperature
Rock trumpet plants are not one to shy away from the full sun. However, in extremely hot climates they will benefit from some light shade over direct sunlight.
If growing dipladenia indoors keep the plant in a sunny window.
It is not a very cold hardy plant. It requires warmer temperatures ranging from 65 to 70 degrees Fahrenheit.
It can be overwintered indoors if the temperatures are falling too low.
Watering and Feeding
These tropical plants require frequent watering in the summer months. Be careful not to overwater or else you will risk root rot setting in.
Let the soil dry out between watering and apply a layer of mulch for extra drainage.
This plant is also tolerant of some occasional droughts due to the roots’ ability to store water.
Dipladenia does not require a lot of feeding. Feed with a slow-release fertilizer in the early spring.
Or feed once or twice a month at most during the growing season using a good liquid plant food.
It should not be fed during winters.
Soil and Transplanting
Dipladenia will require a good, well-drained potting soil.
A potting mix with good insulation and moisture will keep the plant from needing frequent transplanting.
When transplanting Dipladenia, try to retain as much of the roots as you can.
If transplanting a fully grown plant, ideally use a larger container, so the plant has more space to grow.
In the case of transplanting in the garden, the hole should be as deep as the plant’s root ball but much wider.
This allows the roots ample space to spread.
Grooming and Maintenance
Cutting back the tips of plants will encourage them to have a bushier growth.
This should be done when the plant is not in full flowering mode.
Late winter or early spring is best.
How To Propagate and Grow Dipladenia
Propagate Mandevilla and Dipladenia from vine cuttings.
- Remove a mature vine and strip off the leaves around it.
- Wash off the sap that may leak from the cutting
- Dip the cut vine stem into rooting powder
- Once the cut drys, place it into a prepared container or pot.
- Position the newly planted vine in a warm location with plenty of light.
If outdoors, a greenhouse is an ideal location or an eastward facing window if it’s being kept indoors.
Make sure to keep the soil moist by spraying it lightly until the plant takes root.
Dipladenia Pest and Disease Problems
Dipladenias are susceptible to spider mites and aphids.
These can be handled through spraying insecticide soap on the pests.
There is also a chance your plant will develop fungal diseases.
These can be handled fairly easily by using a fungicide to contain the spread.
Be careful when handling Dipladenia as their vines contain a skin-irritating sap.
Wear gloves while handling the plant.
Suggested Dipladenia Uses
Dipladenias are great plants to use both as an ornamental indoors plant or as a garden accent for container gardening.
Its bright colors are conducive to attracting hummingbirds and bees.