Radermachera sinica (China Doll, Serpent Tree, Emerald Tree, Radermachera)


Botanical Information

FamilyBignoniaceae
GenusRadermachera
Speciessinica
SynonymsStereospermum sinicum
CategoryTropicals
TypeTree (evergreen)
OriginSouthern and eastern Asia.

Details

USDA Hardiness Zone10 - 12
USDA Hardiness Ref.
Canadian Hardiness ZoneRequires cold season protection under glass.
Canada Hardiness Ref.
RHS Hardiness ZoneH1b - H3
RHS Hardiness Ref.
Temperature (°C)-5 - 15
Temperature (°F)23 - 59
Height7.6 - 9 m
Spread4.5 - 7.6 m
Flowering PeriodMarch, April, May, June, July, August

Description and Growing Information

General DescriptionBroadleaf evergreen tree that makes a popular houseplant.
LandscapeWhere winter hardy, this tree serves as an interesting specimen/accent or small shade tree in protected areas of the landscape. Where not winter hardy, grow as container plant for patios or porches that must be overwintered indoors.
PropagationBy stem cuttings in summer.
CultivationBest grown in full sun to part shade with rich, consistently moist, well-drained soil. Soil cannot be allowed to dry out, but don’t let plant sit in water. Protect from direct sun and strong winds.
PestsAphids and spider mites.
Notable SpecimensCentennial Conservatory, Thunder Bay, Ontario, Canada.
HabitatSubtropical mountain areas.
Leaf DescriptionBipinnate compound leaves that grow to 76 cm long with leaflets up to 5 cm long.
Flower DescriptionFragrant, trumpet-shaped, and crinkly-petaled. Flowers grow to 7.5 cm long, which bloom in panicles at the leaf axils or branch ends.
Fruit DescriptionNon-showy fruits grow in slender capsules.
Colour DescriptionLeaves are bright to dark green. Flowers are white or yellow.
Texture DescriptionLeaves are glossy.

Photographs