Haageocereus versicolor
| Light | Full sun to very bright light |
|---|---|
| Water | Moderately in the growing season; keep dry and cool in winter |
| Soil | Fast-draining, mostly mineral mix (see Soil and potting mix) |
| Temperature | Keep above freezing; roughly USDA zones 9b–11 |
| Propagation | Seed; stem cuttings |
| Toxicity | Non-toxic to cats and dogs |
Haageocereus versicolor is a columnar cactus from the coastal deserts of northern Peru, grown above all for its dense spination, which ranges from golden yellow to brownish and deepens with age and sun exposure. The specific epithet versicolor means "variously coloured", a reference to the range of spine hues. It is one of many ornamental species in the genus Haageocereus.
Description
Haageocereus versicolor is an erect to slightly leaning columnar cactus that branches mainly from the base, forming clumps of ribbed stems several centimetres thick. The stems are divided into numerous low, rounded ribs lined with closely set areoles, and the whole column is densely clothed in fine spines that all but hide the green body beneath.
The spines are the plant's most conspicuous feature. Newly produced spines emerge golden to yellowish and deepen to brownish or coppery tones with age and strong sun, so the column shows a warm range of colours overall. Older growth typically weathers to greyer tones lower down, while the actively growing tip carries the freshest, brightest colour.
Like others in the genus, mature plants can produce slender-tubed, white flowers near the stem tips; these are night-opening, unfurling in the cooler hours after dusk and often fading by the following day.
Distribution and habitat
The species is native to Peru, where it grows on arid coastal slopes and desert hills. This is a landscape of very low rainfall, where much of the available moisture arrives as coastal fog (garúa) rather than rain. Plants root in gritty, sharply drained mineral ground in full, unfiltered sun, conditions that favour dense, well-coloured spination.
Cultivation
Haageocereus versicolor is a rewarding grower that repays bright conditions. Give it the strongest light you can — full sun outdoors in suitable climates, or the sunniest spot under glass — as strong light is what keeps the spines densely produced and richly coloured; plants grown too dim tend toward pale, sparse, less banded growth. Pot it in a very free-draining, mostly mineral mix.
Water moderately while the plant is in active growth, always letting the mix dry out well between waterings, and then keep it dry and cool through winter to prevent rot and to encourage flowering. Good airflow and a snug pot both help. See Watering and Repotting for general technique.
Propagation
The species can be raised from seed, sown on a warm, mineral surface kept lightly humid until germination, then grown on hard in bright light for the best spine colour. It is also easily propagated from stem cuttings: remove a section of stem with a clean blade, let the cut end callus for a week or two in a dry, shaded spot, then set it on barely-moist mineral mix to root. Basal clumps can likewise be divided.
Common problems
- Rot — usually from overwatering, a slow-draining mix, or cold wet conditions in winter; stems soften and discolour, often from the base.
- Etiolation and poor colour — too little light produces thin, pale, weakly spined growth with muted colour instead of the bright columns the species is grown for.
- Pests — mealybugs (white fluff tucked among the spines and areoles) and red spider mites (fine webbing, a bronzed sheen) are the usual offenders; see Pests and diseases.
See also
- Haageocereus — the genus overview
- Soil and potting mix · Watering · Propagation — cuttings · Propagation — seed · Repotting · Pests and diseases