Ficus elastica 'Robusta' (Robusta Rubber Tree, Robusta Rubber Plant, Robusta Rubber Bush)


Botanical Information

FamilyMoraceae
GenusFicus
Specieselastica
Cultivar'Robusta'
CategoryTropicals, Woody
TypeTree (evergreen)
OriginThe species is found in India and Eastern Asia, however the cultivar Robusta is of horticultural origin.

Details

USDA Hardiness Zone10b - 11
USDA Hardiness Ref.
Canadian Hardiness ZoneRequires cold season protection under glass.
Canada Hardiness Ref.
RHS Hardiness ZoneH1c - H2
RHS Hardiness Ref.
Temperature (°C)1 - 10
Temperature (°F)33.8 - 50
Height5 - 6 m
Spread1 m
GrowthSlow

Description and Growing Information

General DescriptionEvergreen tree with large, dark coloured leaves.
ShapeUpright and erect.
LandscapeIn the landscape, rubber trees become large wide spreading shade trees. They send down aerial roots that penetrate the soil, become woody and eventually form a trunk. Those grown as interior plants remain a manageable size due to container root restriction, can also be pruned for further size and shape control.
PropagationBy tip cuttings.
CultivationBest grown in partial to full shade in organically rich, well-drained soil. Water thoroughly, and allow soil to dry between watering.
PestsMealybugs, scale, mites, and some fig wasps (non-pollinators will feed off the plant).
Notable SpecimensCentennial Conservatory, Thunder Bay, Ontario, Canada.
HabitatHorticultural origin.
Leaf DescriptionLarge, thick, oval leaves growing up to 30 cm in length and 15 cm in width.
Flower DescriptionNon-flowering.
Colour DescriptionLeaves are very dark grey-green, with newly emerging leaves a striking red.
Texture DescriptionLeaves are glossy and leathery.

Photographs