Brazilian Jasmine - Scarlet Pimpernel, Red Riding Hood (Mandevilla
sanderi, Dipladenia splendens)
Pink variety: Dipladenia Sanderi (aka Mandevilla sanderi) Originally
found in the hills above Rio de Janeiro, but apparently no longer found
in its native habitat.
Description: see below
Conditions:
Does well in tubs and hanging baskets. Requires sunny position, tolerates
partial shade. Not frost tolerant. Needs well drained mulch or potting
mix, with slow release fertiliser application in Spring and late Summer.
Keep moist but do not allow to stand in water.
In warmer parts of Australia will flower abundantly from September
till June or later. In cooler climates it flowers from November to March.
Propagation
Propagate from hardwood cuttings. Sprinkle single node cuttings with
rooting hormone and growth should commence in a month or so.
Mandevilla
Known for its showy flowers, the genus Mandevilla includes plants
that were formerly called Dipladenia. There are about 100 species
of this tropical American woody vine. Most species overwinter only in the
tropical South. In South Carolina they can be treated as annuals or grown
indoors. They can be brought indoors before the first freeze and treated
as a houseplant during the winter months. In the spring, mandevilla can
be returned outside after the last spring freeze or after the threat of
freezing weather has passed. Mandevilla is great trellised in containers
or in hanging baskets.
Quantities of fragrant flowers compensate for sparse foliage and for
the care mandevillas require. The flowers are produced in early summer
and again in early fall, even when plants are very young.
HOW TO GROW MANDEVILLA
Indoors, mandevillas need curtain-filtered or bright indirect sunlight.
Provide night temperatures of 60 to 65 °
F and day temperatures above 70 ° F. Plant
in a mixture of equal parts peat moss, potting mix and builder’s sand.
In spring and summer, feed every two weeks with a fertilizer high in phosphorus
such as 10-20-10.
Outdoors, grow mandevillas in partial shade. They need rich, well-drained,
sandy soil with humus added. Provide a frame, trellis or stake for support.
Pinch young plants to induce bushiness.
Since 45 to 50 ° F is the minimum temperature
that can be tolerated by mandevilla, plants should be moved indoors for
the winter. Before bringing them indoors, examine them carefully for pests.
Look under the leaves, in the leaf axils, and in every conceivable nook
and cranny for insects and their eggs. Remove any diseased or dead leaves
by hand. Insect-infested plants can be doused with a forceful spray of
water to dislodge the pests, or you can use insecticidal soaps or other
appropriate insecticides labelled for use on your plant. You may have to
prune some of the plant to compensate for any root loss.
Move the plants to a lighted location where the temperature is above
45 to 50 ° F. Reduce the frequency of watering
to coincide with the plants’ rest periods induced by the cooler temperatures
and reduced light.
In late winter or early spring before growth begins, prune by removing
old, crowded stems and shortening others. Even if mandevilla is pruned
almost to the ground, it will bloom the same summer on the new shoots,
which develop from the base of the plants.
SPECIES
Mandevilla ‘Alice du Pont’ is a woody, twining evergreen vine. It
grows to a height of 20 feet but is much shorter when grown in a container.
The leaves are dark green, glossy, oval and 3 to 8 inches long. Clusters
of pure pink, flared, trumpet-shaped, 2- to 4- inch flowers appear among
the leaves, spring through fall. Even very small plants in 4-inch pots
will bloom. This cultivar grows well in hanging baskets. Pinch off tips
of new stems to induce dense growth.
Mandevilla ‘Laxa’ or Chilean jasmine (although it is native to
Argentina) is a climbing, woody, deciduous vine. It grows to 15 feet. Leaves
are opposite, oblong or heart-shaped at the base. They are 2 to 6 inches
long, thin and dark green with gray-green undersides. Clustered summer
flowers are white, 2 inches across and trumpet-shaped with a powerful gardenia-like
fragrance. Provide rich soil. If the plant becomes badly tangled, cut it
to the ground in winter. It will bloom on the new growth. Roots are hardy
to about 5 ° F.
Mandevilla ‘Splendens’ is an evergreen similar to ‘Alice du Pont’,
with the same bloom period. The leaves are narrow, pointed and 3 to 8 inches
long. The trumpet-shaped flowers are 2 to 4 inches across, pale pink when
they open, with rose-pink eyes. As the flowers age, their color deepens
to rose. The stems of M. ‘Splendens’ reach 10 to 15 feet in length.
CULTIVARS
-
‘Red Riding Hood’ has deep red flowers.
-
‘Summer Snow’ has sparkling white 3- to 4- inch flowers against dark glossy
foliage.
-
‘Yellow’ has wide, bright yellow flowers. They are lower growing and shrubbier
than the species and superb in hanging baskets.
PROBLEMS
The most common pests are mealybugs, scales,
whiteflies and red spider mites.
See also: Jasmine
Prepared by Marjan Kluepfel, HGIC Information Specialist,
and Bob Polomski, Extension Consumer Horticulturist, Clemson University.
Mandevilla at Clemson
Extension
