Agri Kultuur November 2018 | Page 19

ortucularia afra. “Prostrata” decumbent variety By Dinkum - Own work, CC0, https://commons.wikimedia. org/w/index.php?curid=21438509 By Frank Vincentz - Own work, CC BY-SA 3.0, https:// commons.wikimedia.org/w/index.php?curid=17828919 The genus Portulacaria has been shown to be an outlier, relatively unrelated to the other genera in the family, which are all restricted to small ranges in the arid far west of southern Africa. plants must rely solely on seed to proliferate the species which often proves difficult in dry climates and the plant is becoming sparse because of overgrazing and poor regeneration. Distribution and habitat It is very widespread in the east of South Africa (including Swaziland and Mozambique and adjacent regions). In this moist climate, it is relatively rare, and tends to favour dryer rocky outcrops and slopes. It is also found in much denser numbers in the dryer southern Cape. Here it occurs from the “Little Karoo” of the Western Cape, eastwards up until the thicket vegetation of the Eastern Cape. Spekboom is found most prolifically in the Albany thickets, a woodland ecoregion, which locally is often called noorsveld, after the high number of succulent Euphorbia species, which are often called noors plants. Cultivation and uses PIn the wilds of South Africa, large plants do survive the winter frosts by growing dense enough to provide their own natural cover. Drought-tolerant and fire-resistant, it will endure desert sun and heat once established, which the jade plant will not. Cuttings root very easily in most potting media. The plants are eaten by goats who eat the plant from ground level upwards preventing the plant from spreading. Consequently, these AgriKultuur |AgriCulture Ornamental This versatile plant makes an excellent bonsai specimen, can be clipped successfully into a hedge, is a great screening plant, tolerates semi-arid conditions as well as mild frost and acts as a soil binder or stabiliser in preventing soil erosion. It is also the ideal plant to grow along all our major roads. Several varieties exist - some bred in cultivation, others naturally occurring: • “Limpopo”: A variety with much larger leaves. It is the natural form from the far north of the species’ range. • “Prostrata”: A low-lying, decumbent form that is frequently used as a ground-cover. • “Aurea”: A compact, upright form with rounded leaves that go bright yellow in the sun. • “Foliis variegatus”: A variegated form. • “Medio-picta”: Variegated with a lighter centre. Food source In southern Africa it is commonly eaten. The 19