Frailea phaeodisca
| Light | Bright light with protection from the harshest midday sun; a little shade in summer |
|---|---|
| Water | Sparingly; let the mix dry fully between waterings, and keep dry through winter |
| Soil | Very free-draining mineral mix (see Soil and potting mix) |
| Temperature | Keep above freezing; a cool, dry winter rest suits it well |
| Propagation | Seed (primary); the plants are quick and generous seed setters |
| Toxicity | Non-toxic to cats and dogs |
Frailea phaeodisca is a small, flat, disc-shaped cactus from the grasslands of southern Brazil and Uruguay, prized among Frailea specialists for its neat, low-domed body, dark crown and tidy rows of comb-like (pectinate) spines pressed flat against the skin. Like most of its genus it stays small throughout its life, seldom more than a few centimetres across, and rewards close inspection rather than making a bold display.
Description
Frailea phaeodisca forms a solitary, flattened globe only a few centimetres across, sitting low and disc-like against the soil. The body is a dull grey-green to brownish tone, often darker toward the centre — the "phaeodisca" of the name refers to this dusky crown. The ribs are broken into small, low tubercles, each carrying a neat areole.
The short spines are pectinate: arranged like the teeth of a comb, lying close to the body rather than projecting outward, which gives the plant a smooth, groomed silhouette. Flowers are yellow and open only in warm, bright conditions — and often not fully at all. Like other fraileas, this species is strongly cleistogamous, frequently setting seed from flowers that never properly open, so a healthy plant can quietly fill its little seed pods without any obvious bloom.
Distribution and habitat
The species is native to southern Brazil (Rio Grande do Sul) and Uruguay, where it grows on rocky outcrops and stony ground in open pampa grassland, typically tucked among grasses and low vegetation that shade its small body from the fiercest sun. In habitat these plants root in gritty, well-drained soils and endure a distinct seasonal cycle of warm, moist growing months and cooler, drier rest.
Fraileas are inconspicuous in the wild, contracting down and blending into the surrounding grass and stone, which makes them easy to overlook and part of their appeal to specialist growers.
Cultivation
Frailea phaeodisca is a good subject for the collector who enjoys small, undemanding plants, though — like most fraileas — it dislikes both overwatering and prolonged wet cold. Grow it in a very free-draining, mostly mineral mix in a small pot, in bright light with a little shade from intense summer sun to keep the body from scorching or dulling.
Water thoroughly during the warm months once the mix has dried out, then allow it to dry again before the next watering. Keep the plant dry and cool through winter to prevent rot and to encourage a natural rest. Fraileas are short-lived compared with many cacti, but they compensate by growing quickly and setting seed freely, so a collection is easily kept going from one generation to the next. See Watering and Repotting for general technique.
Propagation
Seed is by far the standard and most reliable method. Because F. phaeodisca is readily self-fertile and often cleistogamous, plants frequently produce viable seed on their own without a second plant or hand pollination. The fine seed germinates easily on a warm, moist mineral surface, and seedlings develop quickly. Given how short-lived individual plants can be, most growers simply keep sowing fresh seed rather than relying on the occasional offset. See Propagation — seed for a full walkthrough.
Common problems
- Rot — the usual cause of loss, almost always from overwatering, a slow-draining mix, or cold wet conditions in winter; the small body softens and collapses quickly.
- Etiolation — too little light (or a mix with too much organic matter) makes the flat disc dome upward and lose its low, tidy form and darker colouring.
- Pests — mealybugs (white fluff around the areoles and roots) and red spider mites are the common offenders on these small plants; check the root zone at Repotting time.
See also
- Frailea — the genus overview
- Soil and potting mix · Watering · Propagation — seed · Repotting · Pests and diseases