Mammillaria prolifera
| Light | Bright light; a few hours of gentle sun, some shade from harsh midday sun |
|---|---|
| Water | Regularly in growth once the mix dries; keep dry and cool in winter |
| Soil | Fast-draining gritty mix (see Soil and potting mix) |
| Temperature | Keep above freezing; hardy to roughly USDA zones 9–11 |
| Propagation | Offsets (easiest); also seed |
| Toxicity | Non-toxic to cats and dogs |
Mammillaria prolifera is a small, freely clustering cactus that quickly builds up dense mounds of soft-spined little heads. Each stem carries cream to pale-yellow flowers near its crown, and — true to its name (prolifera, "producing offspring") — the plant offsets so eagerly that a single head soon becomes a colony. The flowers are followed by slender, coral-red berries that cling to the plant for months, earning it common names such as Texas nipple cactus and silver cluster cactus.
Description
Mammillaria prolifera forms clumps of small, globular to shortly cylindrical stems, each only a few centimetres across but multiplying rapidly into broad, low mats. Like all Mammillaria, the body is covered in spiralling tubercles rather than continuous ribs; from the tip of each tubercle an areole bears both fine, hair-like radial spines that give the plant a soft, silvery-white halo and a few slightly stiffer central spines that may be yellowish to brownish.
Small funnel-shaped flowers, cream to pale yellow and often faintly striped, appear in a ring around the crown of mature heads in spring and early summer. These are followed by the plant's most distinctive feature: narrow, club-shaped berries that ripen bright red-orange and persist for a long time, decorating the clump well into the following season.
Distribution and habitat
The species has an unusually wide natural range for a small Mammillaria, spanning southern Texas, northern and eastern Mexico, and parts of the Caribbean including Cuba and Hispaniola. Several regional forms are recognised, differing mainly in spine colour and density. Across this range it grows in dry scrub, on rocky slopes and in gritty soils, often tucked among rocks or the shelter of low shrubs.
Cultivation
Mammillaria prolifera is one of the easiest and most forgiving cacti for a beginner, tolerant of a wider watering range than many of its relatives. Grow it in a free-draining, gritty mix in a pot broad enough to allow the clump to spread. Give it bright light with a few hours of gentle sun to keep the spination dense and encourage flowering; too little light leaves the heads soft and pale.
Water thoroughly once the mix has dried during the growing season, then let it approach dryness again. Keep the plant dry and cool through winter, both to prevent rot and to promote the spring flush of flowers. See Watering and Repotting for general technique; because clumps build up quickly, plants appreciate potting on every couple of years.
Propagation
Offsets are by far the simplest route: individual heads root readily once detached and allowed to callus for a few days on dry mineral mix. This species also sets seed generously — the persistent red berries are full of viable seed that germinates easily on a warm, humid surface. See Propagation — offsets and Propagation — seed for full walkthroughs.
Common problems
- Rot — the most common cause of loss, usually from a soggy mix or cold, wet winter conditions; heads soften and discolour from the base.
- Etiolation — in too little light the heads elongate and pale, losing their tight, silvery form.
- Pests — mealybugs (white fluff among the tubercles, and on the roots) and red spider mites are the usual offenders; the dense clustering habit can hide infestations, so inspect deep in the clump. See Pests and diseases.
See also
- Mammillaria — the genus overview
- Soil and potting mix · Watering · Propagation — offsets · Propagation — seed · Repotting