Kalanchoe thyrsiflora
| Light | Bright light to full sun; stays compact and keeps its chalky-white bloom with strong light |
|---|---|
| Water | Sparingly; let the soil dry fully between waterings, and keep nearly dry in winter |
| Soil | Fast-draining, gritty mix (see Soil and potting mix) |
| Temperature | Keep above freezing; happiest in warmth, roughly USDA zones 9b–11 |
| Propagation | Leaf and stem cuttings, offsets, and seed |
| Toxicity | Toxic to cats, dogs and livestock if eaten (contains cardiac glycosides) |
Kalanchoe thyrsiflora is a rosette-forming succulent from southern Africa, grown for its broad, rounded, blue-green leaves heavily coated in a chalky white farina (waxy bloom). It closely resembles the better-known paddle plant, Kalanchoe luciae, with which it is very often confused in the nursery trade, but it carries a heavier white farina and, when it blooms, produces a dense spike of fragrant yellow flowers rather than the pale greenish-yellow flowers of K. luciae. It is sometimes sold under the common name desert cabbage.
Description
Kalanchoe thyrsiflora forms a low, compact rosette of thick, paddle-shaped to nearly circular leaves. The leaves are stacked closely on a short stem and are a soft grey-green, densely dusted with a powdery white bloom that can rub off if handled. Unlike K. luciae, which colours up dramatically, K. thyrsiflora stays largely chalky green to white and only occasionally takes on a faint reddish or bronze tint at the leaf margins in strong light.
The plant is monocarpic: after a season or two of growth it sends up a tall, branched flowering spike (a thyrse, hence the name) crowded with small tubular yellow flowers that are noticeably fragrant. The main rosette dies after flowering and setting seed, but by then it has usually produced offsets around the base that carry on.
The reliable way to tell it apart from K. luciae is at flowering time: K. thyrsiflora has bright yellow, scented flowers, while K. luciae has pale greenish-yellow flowers that are not fragrant. Out of bloom, the heavier white farina and lack of red leaf colour are useful but not foolproof clues.
Distribution and habitat
The species is native to southern Africa, where it grows on rocky slopes and among grasses in seasonally dry country, in South Africa, Eswatini, Lesotho and neighbouring areas. It is adapted to bright, exposed sites with sharp drainage and a marked dry season, which is reflected in its care in cultivation.
Cultivation
Kalanchoe thyrsiflora is an easy, forgiving succulent for a sunny windowsill, bright greenhouse or, in frost-free climates, the open garden. Give it as much light as you can: strong light keeps the rosette tight and encourages the dense powdery bloom, while too little light stretches the plant and makes it floppy. Grow it in a gritty, free-draining mix and water only when the soil has dried out, easing off almost completely through winter. As with most succulents, overwatering and cold, wet soil are the main dangers — see Watering and Repotting for general technique.
Handle the leaves as little as possible, since the white farina is easily marked by fingerprints and does not grow back until the next flush of growth. If you want to keep a clump going indefinitely, remove the flower spike as it appears, or simply let the plant bloom and rely on its offsets to replace it.
Propagation
The species propagates readily. The easiest routes are removing rooted offsets from around the base, or taking leaf and stem cuttings and letting the cut surface callus for a few days before setting it on a barely moist, gritty mix. Whole leaves laid on the surface will often form plantlets at the base. Fresh seed also germinates well on a warm, mineral surface — see Propagation — seed — and is worth trying if you want quantity, though cuttings and offsets are faster and come true to the parent.
Common problems
- Etiolation — too little light stretches the stem and spreads the rosette open; move to a brighter spot.
- Rot — soft, browning leaves or a collapsing stem, almost always from overwatering or a slow-draining mix.
- Marked bloom — the chalky farina rubs off where leaves are touched or splashed; it only recovers on new growth, so water at soil level and handle gently.
- Pests — mealybugs (white fluff tucked between the leaves) and aphids on the flower spike are the usual visitors. See Pests and diseases.
See also
- Kalanchoe — the genus overview
- Kalanchoe luciae — the very similar paddle plant, frequently confused with this species
- Soil and potting mix · Watering · Propagation — offsets · Propagation — cuttings · Propagation — seed