Eriosyce subgibbosa
| Light | Bright light with plenty of direct sun; tolerates cool, airy conditions |
|---|---|
| Water | Moderate in the growing season, allow to dry between waterings; keep dry in winter |
| Soil | Fast-draining mineral mix (see Soil and potting mix) |
| Temperature | Keep above freezing; enjoys a cool, buoyant winter rest |
| Propagation | Seed (see Propagation — seed) |
| Toxicity | Non-toxic to cats and dogs |
Eriosyce subgibbosa is a spiny, cylindrical cactus from the coastal hills and cliffs of central Chile, and one of the classic plants of the old genus Neoporteria. It forms a mostly solitary green to grey-green stem clothed in a dense armour of straight to slightly curved spines, and carries slim, tubular pink flowers that open at the crown — a look so characteristic that growers still speak fondly of the "Neoporteria type". It belongs to the genus Eriosyce, which now absorbs the former genera Neoporteria, Neochilenia and several others.
Description
Eriosyce subgibbosa begins life as a small globe and lengthens with age into a cylinder up to about 10 cm across; it commonly stands some 15–40 cm tall, and old plants can become considerably longer — up to around 90 cm or more — usually staying solitary but occasionally branching. The body is divided into numerous low ribs broken into gentle, chin-like tubercles, each bearing an areole from which radiates a dense cover of spines. Spine colour is variable — whitish, honey-yellow, golden, amber-brown or nearly black — and the overall spination is often thick enough to partly obscure the green skin beneath.
The flowers are the hallmark of the species. They are narrow and tubular, carried at or near the growing tip, and typically appear in shades of pink to carmine, often paler toward the throat. In the manner of many former Neoporteria, the blooms open only partway, keeping a slim, half-closed profile rather than flaring wide. Flowering is often generous and comes chiefly from late winter into spring rather than at the height of summer.
The species is highly variable across its range, and many named forms and former species now fall under this one name.
Distribution and habitat
The species is native to Chile, where it is confined to the coast, ranging over a broad stretch of the country — roughly from the Atacama Region in the north-central zone south to Biobío — from sea level up to around 300 m. It is well adapted to an arid, Mediterranean-type climate with mild, wetter winters and dry summers, and many populations sit within reach of the sea fog (camanchaca) that drifts in off the Pacific, supplying moisture even during rainless spells. Plants root in rocky, gritty ground on coastal terraces, slopes and cliffs among sparse scrub.
Because of this coastal origin, E. subgibbosa is accustomed to cool, bright, airy conditions rather than fierce desert heat — a useful thing to keep in mind in cultivation.
Cultivation
Eriosyce subgibbosa is a rewarding grower that appreciates conditions echoing its coastal home: strong light, fresh air and a cool winter rest. Grow it in a very free-draining, mostly mineral mix in a pot that drains freely, and give it as much direct sun as you can — good light keeps the spination dense and the body compact.
Water moderately through the warm growing season, letting the mix dry out between drinks, then keep the plant dry over winter. Cool, dry winter conditions are important both to prevent rot and to encourage the following season's flowers. The species dislikes stale, humid heat, so ventilation matters; unlike many desert cacti it will not sulk in cooler, brighter spells. See Watering and Repotting for general technique.
Propagation
Seed is the usual and most reliable method. Fresh seed sown on a gritty, mineral surface and kept warm and humid germinates well, and raising plants from seed is the best way to capture the natural variation in body form, spination and flower colour. The species is typically solitary and seldom offsets, so vegetative propagation is uncommon. See Propagation — seed for a full walkthrough; growers in a hurry sometimes speed young seedlings along by grafting before returning them to their own roots.
Common problems
- Rot — the commonest cause of loss, almost always from overwatering, a poorly draining mix, or damp stagnant conditions in winter.
- Weak, etiolated growth — too little light produces a pale, drawn-out stem with sparse spines; move the plant somewhere brighter.
- Pests — mealybugs (white fluff in the areoles and at the roots) and red spider mites (fine webbing, bronzed skin) are the usual offenders. See Pests and diseases.
See also
- Eriosyce — the genus overview
- Soil and potting mix · Watering · Repotting · Propagation — seed · Grafting · Pests and diseases