Rebutia fiebrigii
| Light | Bright light with some direct sun; can take full sun in cooler climates |
|---|---|
| Water | Regularly in spring–autumn once dry; keep completely dry and cool in winter |
| Soil | Fast-draining, mostly mineral mix (see Soil and potting mix) |
| Temperature | Frost-hardy to just below freezing if kept bone dry; happiest in USDA zones 9b–11 |
| Propagation | Seed and offsets; occasionally cuttings |
| Toxicity | Non-toxic to cats and dogs |
Rebutia fiebrigii is a small, free-flowering clumping cactus from the high Andes of southern Bolivia and northern Argentina. It forms low mounds of globular, densely white-spined heads and produces a ring of bright orange (sometimes reddish-orange) flowers around the lower sides of each stem, making it one of the most cheerful and rewarding of the beginner-friendly Rebutia. It is highly variable across its range, and it is often placed in the segregate genus Aylostera (as A. fiebrigii).
Description
Rebutia fiebrigii is a small, clustering cactus whose individual heads are globular to shortly cylindrical and typically only a few centimetres across. Each stem is closely covered in fine, bristly white to pale-yellow spines that radiate from small areoles, often obscuring the green body beneath and giving the plant a soft, woolly-white look. With age a single seedling builds up into a low, spreading clump of many heads.
The flowers are the main attraction: funnel-shaped, glossy and vivid orange to orange-red, borne not from the crown but around the lower sides of the stems. They open over several days in spring and early summer, and a well-grown clump can be almost hidden under bloom. As with many rebutias, flowering is generous even on young plants.
The species is genuinely variable in spine density, colour and stem size across its wide range, and numerous named forms and field-collection numbers circulate among collectors.
Distribution and habitat
Rebutia fiebrigii grows at high elevation in the eastern Andes of southern Bolivia — particularly the Tarija region — and across the border into northern Argentina. In habitat it grows among rocks and in gritty, well-drained soils on slopes, often tucked into crevices or sheltered by grasses and low vegetation. The mountain setting means cool nights and a pronounced dry season, conditions that shape how the plant is best grown in cultivation.
Cultivation
This is an easy and rewarding cactus for the beginner. Grow it in a free-draining, mostly mineral mix in a pot that is not too large, in bright light with some direct sun to keep the spination tight and encourage heavy flowering. Water regularly through the growing season once the soil has dried, then reduce sharply as autumn ends.
The key to both flowering and long-term health is a cold, completely dry winter rest. Kept bone dry, R. fiebrigii tolerates near-freezing temperatures and even brief light frost, and this cool dormancy is what triggers the spring flush of buds; plants kept warm and watered through winter often flower poorly. Overwatering in a heavy mix is the main cause of loss. See Watering and Repotting for general technique.
Propagation
The species is easily propagated. Mature clumps produce offsets (pups) that can be detached, allowed to callus and rooted as offsets. It also comes readily from seed, which germinates easily on a warm, gritty surface kept humid — seed-raised plants are the usual way the variable forms are maintained. Detached heads can also be treated as cuttings.
Common problems
- Rot — from overwatering, a slow-draining mix, or moisture during the winter rest; heads soften and discolour from the base.
- Shy flowering — usually a sign of too little light or too warm and wet a winter; give a proper cold, dry dormancy.
- Etiolation — insufficient light makes stems stretch and pale and loosens the spination.
- Pests — mealybugs (including root mealybugs) and red spider mites are the usual culprits; see Pests and diseases.
See also
- Rebutia — the genus overview
- Soil and potting mix · Watering · Propagation — offsets · Propagation — seed · Repotting