Crassula falcata
| Light | Bright light to a few hours of direct sun; full sun deepens the grey colour and encourages flowering |
|---|---|
| Water | Moderate in growth; let the mix dry out between waterings, keep drier and cooler in winter |
| Soil | Gritty, fast-draining succulent mix (see Soil and potting mix) |
| Temperature | Keep above freezing; USDA zones 9b–11 |
| Propagation | Leaf and stem cuttings (easy); offsets; seed |
| Toxicity | Generally regarded as non-toxic, but best kept away from curious pets and children |
Crassula falcata is a striking South African succulent grown for its thick, grey-green, sickle-shaped leaves, which are stacked edgewise in two rows so that they resemble the blades of a propeller — hence its common name propeller plant. In late summer it crowns itself with a dense, dome-shaped head of bright red to orange flowers, one of the boldest floral displays in the genus Crassula. It is sometimes still sold under its older name Crassula perfoliata var. falcata.
Description
Crassula falcata forms an upright, somewhat top-heavy rosette that can reach 30–60 cm tall over time, often branching and leaning as it matures. The leaves are the plant's signature feature: fleshy, flattened, and curved into a scythe or propeller shape, coated in a waxy grey-green to almost silvery bloom that helps them shrug off strong sun. They are arranged in two opposite ranks, each successive pair turned at an angle to the last, giving the whole stem a spiralling, bladed look.
In late summer the plant produces a large, rounded, tightly packed inflorescence of small scarlet to orange flowers held just above the foliage. The bloom is long-lasting, lightly scented, and a magnet for pollinators. After flowering the main head often declines while side shoots take over, so a well-grown plant tends to become a clumping colony rather than a single stem.
Distribution and habitat
The species is native to the Eastern Cape of South Africa, where it grows on warm, rocky slopes and among scrub, frequently rooted into shallow, gritty pockets of soil. It is a warm-season grower, taking most of its water during the warmer months and resting through the cool of winter. The waxy grey leaf coating is an adaptation to bright, exposed positions and reflects excess light and heat.
Cultivation
Crassula falcata is an easy and rewarding plant for a sunny windowsill or a bright, frost-free greenhouse. Give it as much light as you can — a few hours of direct sun keeps the leaves compact, deepens their grey colour, and is essential for good flowering; in too much shade the plant stretches and leans badly. Grow it in a gritty, free-draining mix and water thoroughly once the soil has dried, easing off through the cooler months. Like most Crassula, it dislikes sitting wet and will rot at the base if overwatered or left in a heavy, damp compost.
Because mature stems become tall and top-heavy, plants often benefit from occasional restarting from cuttings to keep them tidy. See Watering and Repotting for general technique.
Propagation
Propagation is very easy. Both leaf and stem cuttings root readily: take a healthy leaf or a section of stem, let the cut surface callus for a few days, then set it on or in a barely-moist gritty mix. Established clumps also produce offsets that can be separated and potted individually. Seed is possible but slower and rarely necessary given how willingly the plant grows from cuttings. See Propagation — cuttings, Propagation — leaf and Propagation — offsets for full walkthroughs.
Common problems
- Rot — the commonest cause of loss, almost always from overwatering or a slow-draining mix; the base or stem softens and browns.
- Etiolation — too little light makes the plant stretch, lean, and lose the tight propeller arrangement of its leaves.
- Pests — mealybugs (white fluff tucked between the leaves) and, less often, aphids on the flower stalks; see Pests and diseases.
See also
- Crassula — the genus overview
- Crassulaceae
- Soil and potting mix · Watering · Propagation — cuttings · Propagation — leaf · Repotting