Agapanthus praecox subsp. orientalis
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
Agapanthus praecox subsp. orientalis plants occur naturally mostly in full sun on
rocky outcrops in the
at an altitude of about 1500 feet where they grow in very shallow soils
little or no competition from other plants.
plants are fairly large to medium growing evergreen and clump forming
reproduce naturally by means of seed
plants are most decorative having dark glossy green leaves and a very
growth habit, they produce spectacular blue flowers in profusion in
natural habitat they are able to withstand long periods of drought
to the very large succulent root mass 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
are generally very disease resistant being attacked on occasion by a
caterpillar in particularly when they are growing luxuriously as occurs
they are provided with large amounts of nutrient and water. Flower
can also be attacked by fungus during periods of very warm wet weather
prevents the flowers from opening.
Suitability as Green Roof plants
plants are medium to large plants which do not like competition from
growing plants. They are probably best suited as feature plants, but
possibly be planted en mass. These plants are most probably best
from splits or 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
robust habitat and protection for other green roof dwellers. Their
attract pollinating insects in particular solitary bees.
Cautions and precautions in the
None that I
am aware of at the moment