Conophytum bilobum
| Light | Bright light with a few hours of gentle sun; part shade from harsh summer midday |
|---|---|
| Water | Autumn and winter growing season only; keep dry through summer dormancy |
| Soil | Very free-draining mineral mix (see Soil and potting mix) |
| Temperature | Keep above freezing; frost-tender, USDA zones 10–11 |
| Propagation | Seed and division of clumps (see Propagation — seed, Propagation — offsets) |
| Toxicity | Generally regarded as non-toxic to cats and dogs |
Conophytum bilobum is a popular, easy-going dwarf succulent from the winter-rainfall region of South Africa, and one of the most recognisable members of the genus Conophytum. Each plant body is a fleshy pair of fused leaves, cleft at the top into two distinct rounded lobes — the "bilobed", heart-shaped shape that gives it its name — in shades of green to bluish-grey, often edged with a fine red rim. In autumn it produces cheerful yellow flowers, making it a favourite first cono for many collectors.
Description
Conophytum bilobum forms small clumps of paired-leaf bodies, each body typically 2–4 cm tall. Unlike the squat, button-shaped bodies of many conos, the two lobes here are pronounced and somewhat keeled, giving a distinctly heart-shaped or "bunny-eared" silhouette when viewed from the front. Colour ranges from fresh green to a soft bluish or grey-green, and the upper edges and lobe tips are frequently lined with red, especially when the plant is grown in good light.
Flowers appear in autumn, opening in the daytime: they are usually bright yellow, silky-petalled and scentless, emerging from the fissure between the two lobes. Like other conos, the plant follows an annual cycle — each year a new body forms inside the old one, which dries to a papery sheath that protects the plant through its dormant summer.
Distribution and habitat
The species is native to the Northern Cape province of South Africa, in the winter-rainfall Namaqualand region. It grows on rocky outcrops, in quartz gravel and in cracks between stones, often nestled where a little shade and runoff collect. This is a highly variable species with many local forms and subspecies described across its range, differing in body size, colour and degree of lobing.
Its habitat receives most of its moisture in the cooler months, which is the key to understanding its care: the plant is an autumn-and-winter grower that rests, shrivelled and protected, through the hot dry summer.
Cultivation
Conophytum bilobum is among the more forgiving conos, which is why it is so often recommended to beginners. The single most important thing is to respect its seasonal rhythm. Grow it in a shallow pot in a very free-draining, mostly mineral mix in bright light with a little protection from the fiercest summer sun.
Water during the active season — from late summer or autumn, when the new bodies swell and the old sheaths split, through winter — allowing the mix to dry between waterings. As spring warms, taper off; through summer keep the plant essentially dry, giving at most an occasional light misting if bodies shrivel excessively. The old dried skins are normal and protective, so resist the urge to peel them. Overwatering, especially during the summer rest, is the usual cause of loss. See Watering and Repotting for general technique.
Propagation
The species is easily propagated by both seed and division. Established clumps can be lifted and split at the start of the growing season, letting the divisions callus briefly before potting into a gritty mix and watering lightly to establish. Seed is sown in autumn onto a fine mineral surface kept humid and cool; germination is generally good, and seedlings are the best way to capture the diversity of forms this species offers. See Propagation — seed and Propagation — offsets for full walkthroughs.
Common problems
- Rot — almost always from watering during summer dormancy or from a mix that holds too much moisture; bodies go soft, translucent and mushy.
- Failure to renew — bodies staying stuck in old sheaths or not forming new growth usually points to a disrupted watering cycle or too little light.
- Etiolation — insufficient light makes bodies stretch tall, pale and floppy, losing the red edging and compact form.
- Pests — mealybugs (white fluff in the fissure and among roots) and, less often, spider mites are the main culprits; check the root zone at repotting.
See also
- Conophytum — the genus overview
- Soil and potting mix · Watering · Propagation — seed · Propagation — offsets · Repotting · Pests and diseases