Astroloba corrugata
| Light | Bright light to light shade; protect from harsh midday sun |
|---|---|
| Water | Sparingly; let the mix dry fully between waterings, near-dry in winter |
| Soil | Gritty, fast-draining mineral mix (see Soil and potting mix) |
| Temperature | Keep frost-free; roughly USDA zones 9b–11 |
| Propagation | Offsets and seed |
| Toxicity | Generally regarded as non-toxic to cats and dogs |
Astroloba corrugata is a slow-growing South African succulent that forms small clumps of short, sprawling to semi-erect stems densely clothed in firm, keeled leaves. A member of the alooid group within the family Asphodelaceae, it is prized by collectors for its neat geometric habit and its roughened, finely tubercled leaf surfaces, from which the species takes its name.
Description
Astroloba corrugata forms short, branching stems — often sprawling and reaching up to about 20 cm long — that offset from the base to gradually build a small clump. The stems are densely covered in spirally arranged, outward-pointing leaves, loosely set in roughly five rows, though the arrangement is variable. The leaves are stiff, pointed and slightly keeled, green but flushing reddish or bronze in strong sun, and their outer surface is roughened by tiny scattered tubercles — the corrugated texture from which the species takes its name.
The flowers are small and tubular, carried in a slim, sparse raceme that rises from among the leaves in summer. As in most Astroloba, the blooms are modest — creamy-white, sometimes tinged pink or green, rather than showy — and this is a plant grown chiefly for its architectural foliage rather than its flowers.
Distribution and habitat
The species is endemic to the far western end of the Little Karoo, in the Western Cape of South Africa, where it typically grows on shale or clay flats in dry, open scrub. Plants often nestle among low companion vegetation that offers a little shade and shelter from the most intense sun, enduring long dry spells and receiving most of their moisture seasonally.
Like other slow, habitat-specialised succulents, wild populations are best left undisturbed; nursery-grown material is the responsible source for collectors.
Cultivation
Astroloba corrugata is an undemanding but deliberate grower that rewards patience. Grow it in a very free-draining, mostly mineral mix in a pot that suits its slow root system, and give it bright light with a little protection from scorching midday sun to keep the stems compact and well-coloured. Water thoroughly only once the mix has dried out, then allow it to dry again; through winter keep the plant nearly dry and cool to prevent rot.
Overwatering and a stagnant, water-retentive mix are the main causes of loss, so err on the side of dryness. See Watering and Repotting for general technique.
Propagation
The easiest method is to remove rooted offsets from the base of an established clump and pot them into a gritty mix; see Propagation — offsets. The species can also be raised from seed, though seedlings grow slowly and require patience. Because Astroloba plants hybridise readily with related genera and with one another, seed of garden origin may not come true — offsets are the surest way to keep a particular plant unchanged.
Common problems
- Rot — almost always from overwatering or a slow-draining mix; the base or lower leaves soften and discolour.
- Etiolation — too little light stretches the stems and loosens the tidy leaf ranks.
- Pests — mealybugs (white fluff tucked between the leaves and at the roots) are the most common; watch also for scale and root mealybug.
See also
- Astroloba — the genus overview
- Soil and potting mix · Watering · Propagation — offsets · Repotting · Pests and diseases