Huernia hystrix
is one of a number of plant species which are presently being tested for their suitability to be grown as Green Roof plants in the Durban region that have initially shown good results. They all occur naturally within a radius of 50 km of the Durban city centre

Huernia hystrix is found growing amongst rocks in hot dry places both in full sun and in shade in a number of localities in the Durban area.

Growth habit
Huernia hystrix is a dwarf stem succulent which is heavily exploited for traditional medicine by the Zulu people of Kwa Zulu Natal.

Propagation
Huernia hystrix reproduce naturally by means of seed which germinates readily under ideal conditions. In cultivation they can be propagated vegetatively by subdivision, by tissue culture as well as from seed.

Decorative value
Huernia hystrix plants are being grown for their very attractive growth form as well as their interesting flowers

Drought resistance
Huernia hystrix plants are extremely drought resistant, they are usually found growing in very hot and dry stony places.

Disease and pest resistance
Huernia hystrix susceptible to attack by mealy bug if they are grown in a nutrient rich medium

Suitability as Green Roof plants
Huernia hystrix plants are valuable in combination with other plants that do not have a vigorous nature because of their extreme heat and drought tolerance and ability to grow in very shallow dry soils. 

Biodiversity value in the Green Roof landscape
A number of butterflies use Huernia hystrix as their larval host plants such as the African Monarch Danaus chrysippus aegyptius . Their flowers attract large numbers of flies.

Cautions and precautions in the Green Roof application
Care must be taken to ensure good drainage and to prevent rotting during establishment. Be careful not to over fertilize.