Encephalartos princeps (Kei Cycad, Kei River Cycad)


Botanical Information

FamilyZamiaceae
GenusEncephalartos
Speciesprinceps
CategoryTropicals, Woody
TypeShrub (evergreen)
OriginSouth Africa and is restricted to the catchment area of the Great Kei River (Eastern Cape).
Ethnobotanical Uses
Disclaimer
Indigenous people used to make bread from cycad stems.

Details

USDA Hardiness Zone9b - 11
USDA Hardiness Ref.
Canadian Hardiness ZoneRequires cold season protection under glass.
Canada Hardiness Ref.
RHS Hardiness ZoneH3 - H1c
RHS Hardiness Ref.
Temperature (°C)above 4.5
Temperature (°F)above 40
HeightUp to 5 m

Description and Growing Information

ID CharacteristicA blue-leaved cycad that responds well to full sun and tolerates any soil type.
LandscapeDecorative or focal point plants and grouped plantings.
PropagationBy seeds and suckers.
PestsScale insects, beetles and chewing insects.
Notable SpecimensHarry P. Leu Gardens, Orlando, Florida, United States of America.
HabitatGrows in riverine scrub between rocks and on doleritic cliffs. The annual rainfall in its distribution area ranges from 420-520 mm, with hot summers and cool winters.
Bark/Stem DescriptionA woody plant with about 10-15 aerial, erect stems that form a cluster, though the stems may sometimes recline or lie flat on the ground. The stems may develop to a height of up to 5 m and a diameter of 30-40 cm. 
Leaf DescriptionStraight but curving downwards at the apex, blue-green with a silvery bloom when still young, but darken slightly with age, leaves are 120-200 mm long. The median leaflets attain a length of up to 12-15 cm and a width of 1-1.3 cm. The leaflets at the base are reduced in size, and have one or two spines at the most.
Fruit DescriptionMale and female plants bear 1-3 dull green cones per season per stem. The male and female cones produce powerful odours in the early morning or evening to attract weevils. When the weevils move between the sexes, they inadvertently transfer the pollen from the male cones to the receptive ovules of the female cones.

Photographs