Gymnocalycium anisitsii
| Light | Bright, filtered light; some shade from harsh midday sun |
|---|---|
| Water | Regularly in the growing season once the mix dries; keep dry and cool in winter |
| Soil | Fast-draining, gritty mineral mix (see Soil and potting mix) |
| Temperature | Keep above freezing; roughly USDA zones 9b–11 |
| Propagation | Offsets and seed |
| Toxicity | Non-toxic to cats and dogs |
Gymnocalycium anisitsii is a variable, readily clumping cactus from Paraguay and neighbouring parts of Bolivia, known for its sharply angular ribs and freely borne white to pale pink flowers. It is an easygoing, forgiving member of the genus Gymnocalycium that offsets happily into tidy mounds, making it a great beginner's chin cactus.
Description
Gymnocalycium anisitsii forms a flattened to shortly cylindrical green to grey-green body that clusters with age, producing offsets around the base and building into a low clump. As with all chin cacti, the ribs are broken into tubercles bearing a small "chin" or notch beneath each areole — here the ribs are notably angular and rather sharp-edged, giving the plant a firm, geometric outline. The spines are stiff, few per areole, and often curved back against the body, ranging from pale straw to grey and sometimes darker at the tips.
The species is well known for being variable: body colour, degree of tuberculation and spine length differ noticeably from plant to plant, which is part of why it has accumulated several names over the years. Flowers appear from areoles near the crown through the warmer months, funnel-shaped and typically white to soft pink, and the plant tends to bloom generously.
Distribution and habitat
The species is native to Paraguay and adjacent Bolivia, where it grows in dry scrub, grassland and rocky ground, often nestled among low vegetation and stones that give it a little shade and shelter. Plants in habitat frequently grow in gritty, well-drained substrates and tolerate a distinct dry season, contracting and resting when moisture is scarce.
Cultivation
Gymnocalycium anisitsii is one of the more tolerant chin cacti and a good choice for newer growers. Grow it in a free-draining, mostly mineral mix and give it bright light with some protection from the most intense summer sun, which can scorch or bronze the body — many Gymnocalycium prefer slightly softer light than desert cacti from open flats. Water thoroughly during the growing season once the soil has dried, then let it dry again; keep the plant dry and cool through winter, both to prevent rot and to encourage a good spring flush of flowers. See Watering and Repotting for general technique.
Because it clumps freely, it appreciates being potted on when the clump crowds its container, and it makes an attractive multi-headed specimen over time.
Propagation
The easiest method is simply to remove rooted or nearly-rooted offsets and pot them up; let any cut surface callus before setting the offset on a barely-moist mineral mix. The species also grows readily from seed, which germinates well on a warm, humid surface and is the best route if you want to capture the genetic variability of the species. See Propagation — offsets and Propagation — seed for full walkthroughs.
Common problems
- Rot — the usual cause of loss, almost always from overwatering or a slow-draining mix; the base or a head softens and discolours.
- Scorch — too much direct summer sun can bleach or bronze the skin; give light shade at the peak of the day.
- Pests — mealybugs (white fluff in the areoles and around the roots) and red spider mites (fine webbing, dulled skin) are the common offenders. See Pests and diseases.
See also
- Gymnocalycium — the genus overview
- Soil and potting mix · Watering · Propagation — offsets · Propagation — seed · Repotting