Eriosyce villosa
| Light | Bright light to full sun in cultivation; light shade only in the hottest positions |
|---|---|
| Water | Moderately during growth, letting the mix dry between waterings; keep nearly dry over winter |
| Soil | Gritty, fast-draining mineral mix (see Soil and potting mix) |
| Temperature | Keep cool and airy; essentially frost-free, tolerating only brief light frost (to about −5 °C); USDA zones 9b–11 |
| Propagation | Seed |
| Toxicity | Non-toxic to cats and dogs |
Eriosyce villosa is a small, slow-growing cactus from the fog-swept coastal deserts of north-central Chile. It is easily recognised by its dark, dull purplish-grey to almost blackish body, cloaked in fine, close-set spines, and its bright magenta to purple-pink flowers. The species is superbly adapted to one of the driest environments on Earth, drawing much of its moisture from coastal fog rather than rain.
Description
Eriosyce villosa forms a small solitary plant, at first globose and becoming short-cylindrical with age (reaching roughly 15 cm tall and 8 cm across), that may draw down into the soil during drought. The most distinctive feature is its colouring: the epidermis ranges from greyish-green to a sombre dark purplish-grey, sometimes so deep as to look nearly black, an unusual tone among cacti that likely helps the plant cope with intense coastal light. The ribs are well defined and notched into tubercles, each carrying an areole set with numerous fine, hair-like spines that partly veil the body and give the plant its "villous" (softly hairy) appearance.
Flowers appear near the crown; they are small and narrowly funnel-shaped, opening in bright magenta to purple-pink, often with a paler throat. Like other members of the genus, it produces fleshy fruit that dry and release small seeds.
Distribution and habitat
The species is native to the Atacama and Coquimbo regions of the coastal Norte Chico in north-central Chile, where it grows on arid hills and rocky flats within reach of the ocean. This is a true fog desert: measurable rainfall may be absent for long stretches, and plants depend heavily on the camanchaca, the dense marine fog that rolls inland and condenses on the vegetation. E. villosa roots in mineral, often stony ground among sparse companion plants, frequently contracted down flush with the surface for protection from sun and desiccation.
Cultivation
Eriosyce villosa is a slow, characterful plant that rewards restraint. It needs a very open, largely mineral mix with sharp drainage, bright light, and above all careful watering — the fine roots resent standing moisture and the plant is prone to rot if kept damp. Water moderately during the active growing period, allowing the mix to dry between waterings, and keep it nearly dry through winter.
As a coastal species from a mild, foggy climate it dislikes prolonged heat combined with humidity, so good air movement helps. Many growers find plants on their own roots grow very slowly; some speed early growth by grafting seedlings, though own-root specimens keep their natural compact form and dark colouring best. See Repotting for general technique.
Propagation
Seed is the standard and most reliable method, as the species is normally solitary and rarely offsets. Sow onto a mineral surface kept warm and humid until germination, then grow the seedlings on hard and bright to develop good spination and colour. See Propagation — seed for a full walkthrough.
Common problems
- Rot — the commonest cause of loss, almost always from overwatering or a slow-draining mix; the body softens from the base.
- Etiolation — too little light causes weak, pale, elongated growth and loss of the compact form.
- Pests — mealybugs (including root mealybugs) and red spider mites are the usual offenders; check the areoles and roots. See Pests and diseases.
See also
- Eriosyce — the genus overview
- Grafting · Soil and potting mix · Watering · Propagation — seed · Repotting