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
plants occur widely in full sun on rocky outcrops in the
at an altitude of about 1500 feet where they grow in very shallow soils
and in cracks in the rocks mostly with
little or no competition from other plants.
plants are small to medium evergreen to deciduous herbaceous shrubs. They have the habit of
spreading as a result of branches that take root on touching the
reproduce naturally mostly by means of seed
plants have small grey green leaves and a profusion of flowers in the
summer and Autumn, they can
become a little untidy with
natural habitat they are able to withstand long dry periods due
to their semi-succulent nature and large succulent root system which is
quickly able to store
amounts of water.
experience of growing these plants as pot plants I have found them to
Disease and pest resistance
flowers are frequently attacked by mealy bugs.
Suitability as Green Roof plants
plants are small to medium in size. They are probably best suited as
feature plants, but
possibly be planted en mass. These plants are best
from cuttings taken from mature plants.
test conditions where these plants have not been under competition from
vigorous growing plants they are showing good results.
Biodiversity value in the Green
attract large numbers of pollinating insects in particular solitary
bees and small butterflies.
Cautions and precautions in the
None that I
am aware of at the moment