Environmental Landscape Design Specialist

  Creating Bio-Diverse Indigenous Landscapes and Gardens  


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Delosperma lineare CV. Hickman

Plant suitable for use on Green Roofs in the Durban Area

Delospermum lineare

Delosperma lineare

Delosperma lineare
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.


The plants that I am growing are all from a very compact free flowering form that I found growing in full sun above north facing cliffs
overlooking the Umgeni River Valley at Monteseel inland of Durban. This form is a true gem of a plant it is a magnificent horticultural specimen being neat, compact and producing large amounts of clear white flowers over a long period of time. It is easy to grow has not shown any signs of being subjected to rot or any other diseases and has not been attacked by insect pests.


Growth habit
A very neat, small, clump forming succulent with a large tuberous root system.

Growing medium
I have been growing my plants very successfully in a growing medium consisting of expanded clay granules, crushed brick, soil derived from sandstone, and well decomposed compost

Decorative value
These plants are being grown for their neat growth habit and attractive flowers that are produced in abundance

Drought resistance
Although these plants respond very well to irrigation they can survive extended periods of drought.

Disease and pest resistance
To date I have not encountered any disease or pests

Suitability as Green Roof plants
These plants are valuable in plantings in shallow fertile green roof growing mediums that are going to get the very minimum of or no water in winter as well in combinations with other plants that do not have a very vigorous nature. It reproduces it´s self readily from seed.

Biodiversity value in the Green Roof landscape
Their flowers attracts large numbers of insects in particular bees and small butterflies as well as small beetles making it a valuable contributer to the biodiversity in any rooftop or garden.

Cautions and precautions in the Green Roof application
Care should be taken to ensure good drainage in particular during establishment but this being said I have had them establish themselves from seed in areas that I would have thought had been too wet..

Propagation
They can be propagated very easily
in large numbers from seed that germinates readily provided that one takes the care required for growing succulents from seed. For the less experienced grower or the grower who only wants to propagate a small number of plants they can be grown easily from tip cuttings.

Crassulacean acid metabolism
Drought responses of diurnal gas exchange, malic acid accumulation and water status in Delosperma tradescanthioides. When well watered, this species exhibited Crassulacean acid metabolism (CAM)-cycling, but its carbon fixation pattern changed during the development of drought, shifting to either low-level CAM or to CAM idling. The rate and pattern of this change depended on environmental conditions, duration of water stress and leaf age. At the onset of drought, diurnal malate fluctuation increased, but was strongly depressed (by ca 70%) as drought continued, and when leaf water content and water potential were low (ca 35 and 50% of the initial levels, respectively). When rewatered, rates of growth and photosynthesis, gas exchange and water status recovered fully to pre-stressed values within two days. Whole-shoot carbon uptake rates suggested that leaf growth had continued unabated during a short-term ( one week) drought. This emphasizes that CAM-idling allows the maintenance of active metabolism with negligible gas exchange when soil water is limiting. It is possible that old or senescent leaves may provide water for the expansion of developing leaves during initial periods of drought. Regardless of the water regime and environmental conditions, leaf nocturnal malate accumulation and water content were positively correlated and increased with leaf age. Thus the gradual loss of water from older mature leaves may induce CAM-idling, which reduces water loss. An important ecological consequence of this combination of CAM modes is the potential to switch rapidly between fast growth via C3 gas exchanges when well-watered to water-conserving CAM-idling during drought.


Ecoman Durban Indigenous Landscape Design Consultant


Bio-Diverse Indigenous Landscaping I design landscapes and gardens that are Bio-Diverse as well as being pleasing to the eye


Landscapes and Gardens that are Nature Friendly


I use my many years of landscape planning and design as well as landscape construction experience coupled to my vast knowledge of the requirements of nature to create habitat suitable for birds, butterflies and other creatures to live and breed in.

 

I always apply the basic principles of good landscape design to create an aesthetically pleasing garden that at the same time satisfies the living requirements of the target creatures that I would like to attract. My speciality is to attract birds, butterflies and solitary bees. I design and build Bio-Diverse Roof Gardens

 

So let Ecoman design and create a garden for you that will be a haven for wildlife such as birds, butterflies, frogs and lizards in the number of species comparable to Kruger National Park.


For all of your Green Roof requirements contact Michael Hickman Specialist in Green Roof Technology at +27 82 061 2593 or email at info@ecoman.co.za






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This page was created on 21.09.09
This page was last updated on 21.10.13