Fenestraria rhopalophylla
| Light | Very bright light; a few hours of direct sun with protection from scorching midday sun |
|---|---|
| Water | Sparingly; water in autumn and spring, keep nearly dry in summer and mid-winter |
| Soil | Very gritty, fast-draining mineral mix (see Soil and potting mix) |
| Temperature | Keep above freezing; USDA zones 10–11 |
| Propagation | Seed and division of clumps |
| Toxicity | Generally considered non-toxic to cats and dogs |
Fenestraria rhopalophylla is a small, clump-forming succulent from the arid coastal fog deserts of southern Africa, and one of the most charming of the "window-leaved" mesembs. It produces dense mats of upright, club-shaped leaves whose flattened, translucent tops sit flush with the soil surface — the "windows" that let light down into the buried body of the leaf. This habit, together with the plump toe-like leaves, has earned it the affectionate common name baby toes. Large daisy-like flowers, white in the typical form and a warm yellow-orange in the widely grown subspecies aurantiaca, appear above the leaf tips in autumn.
Description
Fenestraria rhopalophylla forms low, spreading clumps of erect, cylindrical to club-shaped leaves, each a few centimetres tall and rounded at the tip. The leaves are smooth, pale grey-green and packed closely together, and their most distinctive feature is the flattened, glassy "window" at the very top. In its native habitat the plant grows almost buried in sand, with only these transparent tips exposed; light passes through the window and down into the leaf to reach the photosynthetic tissue below — an elegant adaptation to a bright, exposed environment.
Flowers are relatively large for the size of the plant, a few centimetres across, and open in the sun during the cooler months. The typical subspecies bears white flowers, while the popular subspecies aurantiaca produces striking yellow to orange blooms.
Distribution and habitat
The species is native to the coastal desert region straddling the border of Namibia and South Africa, in the arid winter-rainfall zone influenced by cold-current sea fog. It grows in deep, sandy or gravelly soils, often nearly submerged so that only the leaf windows show above the surface. Much of its moisture in habitat comes from fog and light seasonal rains rather than heavy downpours, which shapes its needs in cultivation.
Cultivation
Fenestraria rhopalophylla has a reputation as a slightly tricky mesemb, and nearly all of that difficulty comes down to watering. Grow it in a very gritty, mostly mineral mix in a pot deep enough to accommodate the surprisingly long roots, and give it the brightest position you can — plenty of light keeps the leaves short, plump and firm.
The plant follows a winter-rainfall rhythm: water it in autumn and spring when it is in active growth, and keep it nearly dry through the heat of summer and the depths of winter. Overwatering, especially during the summer rest, is the usual cause of loss — the leaves swell, split and rot. When in doubt, water less. Because it naturally grows buried, a generous top dressing of coarse grit around the leaves both mimics habitat and helps keep the vulnerable leaf bases dry. See Watering and Repotting for general technique.
Propagation
The species is readily raised from seed, sown on a gritty surface and kept lightly moist and warm; the fine seedlings are grown on slowly. Established clumps can also be lifted and divided, allowing any cut or torn surfaces to callus before replanting into dry, gritty mix. See Propagation — seed and Propagation — offsets for fuller walkthroughs.
Common problems
- Rot — the most frequent killer, almost always from overwatering or watering during the summer rest; leaves go soft, translucent and mushy.
- Split or bloated leaves — a sign of too much water at once; the swollen leaves burst under the pressure.
- Etiolation — insufficient light makes leaves stretch tall and lax, losing the tight, toe-like look.
- Pests — mealybugs (white fluff between the leaves and around the roots) are the most common; watch also for root mealybugs in the dry, gritty soil.
See also
- Fenestraria — the genus overview
- Soil and potting mix · Watering · Propagation — seed · Propagation — offsets · Repotting