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
Crassula expansa is found growing amongst
rocks both in shade or
semi-shade in a number of localities in the Durban
expansa is a dwarf mat forming succulent.
Crassula expansa reproduce naturally by
means of seed and vegetatively. In
cultivation this plant can
be propagated vegetatively by either planting cuttings of simply by
breaking up the plant into tiny pieces which are then scattered onto
the growing medium which must be given protection from the sun and
watered until they have rooted.
plants are being grown for their very attractive growth form as well as
multitude of small white flowers.
plants are surprisingly drought resistant which is surprising as they
usually grow in shade or semi shaded localities which are rather damp.
Disease and pest resistance
susceptible to attack by mealy bug.
Suitability as Green Roof plants
plants are valuable ground covers because of their dwarf growth habit,
the ease with which they establish themselves and their rapid growth
habit. Under green roof conditions they have displayed extreme heat and
tolerance and the ability to grow in very shallow dry soils.
Biodiversity value in the Green
There profusion of
small white flowers which are produces over an extensive period of time
attract large numbers of insects in particular the honey bee.
Cautions and precautions in the Green Roof
must be taken to ensure good drainage to prevent rotting