Aloe rauhii
| Light | Bright, indirect light; a few hours of gentle sun brings out leaf colour and speckling |
|---|---|
| Water | Water when the soil has dried; reduce in winter, but avoid a completely bone-dry rest |
| Soil | Free-draining gritty mix (see Soil and potting mix) |
| Temperature | Keep frost-free; happiest in USDA zones 10–11 |
| Propagation | Offsets (primary); also seed |
| Toxicity | Mildly toxic to cats and dogs if eaten; generally considered a low risk |
Aloe rauhii is a small, clumping aloe from south-western Madagascar, prized for its short, triangular leaves that are heavily flecked with white spots. That crisp speckling has earned it the common name snowflake aloe, and it is the parent behind a great many popular miniature hybrids sold under 'snowflake'-type names.
Description
Aloe rauhii forms compact rosettes roughly 12–15 cm (5–6 in) across, made up of narrow, pointed leaves that curve gently inward. The leaf surface ranges from grey-green to a warm reddish-bronze in strong light, and is dusted all over with pale, oval to roughly H-shaped white spots, with fine soft teeth along the margins. In good conditions the flecking can be dense enough to look almost white, giving the plant its snowflake nickname.
Mature rosettes offset freely at the base, so a single plant slowly builds into a tidy cluster. Slender flower spikes carry small tubular blooms in shades of pink-scarlet, held well above the foliage and attractive to nectar-feeding pollinators in cultivation.
Distribution and habitat
The species is native to south-western Madagascar, where it grows on sandstone cliffs and rocky outcrops in dry scrub. Like many Madagascan aloes it is adapted to a seasonally dry climate, enduring long rainless spells and drawing on the moisture stored in its fleshy leaves. It is regarded as threatened in the wild.
Reflecting that threatened status, A. rauhii is listed on CITES Appendix I, so trade in wild-collected plants is strictly controlled. Artificially propagated specimens of Appendix I plants are treated as Appendix II for trade purposes, however, so nursery-grown plants are widely available and affordable, and can be traded with the appropriate paperwork.
Cultivation
Aloe rauhii is an easy, forgiving little plant and a good choice for a sunny windowsill. Grow it in a free-draining, gritty mix in a pot that is not too oversized, and give it bright light with a few hours of gentle direct sun to keep the rosette tight and the speckling strong. Too little light causes the leaves to stretch and lose their compact form.
Water when the mix has dried out, watering thoroughly and then letting it approach dryness again; ease off through the cooler months but avoid leaving it completely parched for long stretches, as these Madagascan aloes appreciate a little moisture even in their rest. Overwatering in a heavy mix is the main risk. See Watering and Repotting for general technique.
Propagation
The simplest method is division of the offsets, or "pups", that cluster around the base of an established plant. Detach a rooted offset and pot it into the same gritty mix; it will establish quickly. The species can also be raised from seed, though seedlings are slower. See Propagation - offsets for a full walkthrough.
Cultivars
A. rauhii has been used extensively in hybridising, and its heavy white flecking is the ancestor of countless small "snowflake" and speckled miniature hybrids popular with collectors. The best-known is Aloe 'Snowflake, but many similar named crosses exist. Because these are hybrids, their exact appearance and vigour vary, and care generally follows that of A. rauhii itself.
Common problems
- Rot — from overwatering or a slow-draining mix; the rosette softens and browns, usually starting at the base.
- Etiolation — too little light stretches the leaves, opens up the rosette and fades the speckling.
- Pests — mealybugs (white fluff tucked between the leaves) and, less often, scale and root mealybugs are the usual troublemakers. See Pests and diseases.
See also
- Aloe — the genus overview
- Soil and potting mix · Watering · Propagation - offsets · Repotting