Aztekium hintonii
| Light | Bright light with some shade from harsh afternoon sun |
|---|---|
| Water | Sparingly; allow to dry fully between waterings, dry rest in winter |
| Soil | Very gritty, mostly mineral mix; extra lime/gypsum appreciated (see Soil and potting mix) |
| Temperature | Keep above freezing; USDA zones 9b–11 |
| Propagation | Seed (primary); grafting to speed slow seedlings |
| Toxicity | Non-toxic to cats and dogs |
Aztekium hintonii is a small, slow-growing cactus described in 1992, at the time only the second known member of the tiny genus Aztekium. It is considerably larger than its long-known relative Aztekium ritteri, with numerous sharp-edged, prominently grooved ribs and comparatively large, showy magenta flowers. In the wild it is confined to gypsum outcrops in the Mexican state of Nuevo León.
Description
Aztekium hintonii forms a solitary (occasionally clustering with age), flattened to shortly globular body, typically a few centimetres to around ten centimetres across, with a firm greyish-green surface. The body carries roughly ten to fifteen ribs that are sharp-edged, prominent and separated by deep, sharply cut grooves, giving the plant a distinctly furrowed, sculpted look. The rib flanks are finely wrinkled in the manner characteristic of the genus, and the areoles run in a narrow woolly line along each rib crest. Spines are soft, few and quickly shed, so mature plants appear essentially spineless.
Flowers open from the woolly crown, and are notably large and vivid for the genus: magenta to purplish-pink, appearing in the warmer months. This bright bloom, set against the pale grooved body, is one of the plant's most attractive features and helps distinguish it from the smaller-flowered A. ritteri.
Distribution and habitat
The species is restricted to a small area of Nuevo León in northeastern Mexico, where it grows on steep gypsum outcrops and cliffs. These pale, mineral-rich substrates drain sharply and hold little organic matter, and the plants often sit wedged into crevices or on near-vertical faces alongside other specialised gypsum-loving flora.
Like all cacti, Aztekium hintonii is listed under CITES Appendix II, and its narrow natural range makes wild populations vulnerable to illegal collection. Nursery-propagated, seed-raised plants are the only responsible source; collecting from habitat is both harmful and illegal.
Cultivation
Aztekium hintonii has a reputation for being demanding, chiefly because it is extremely slow and intolerant of a soggy root run. Grow it in a very free-draining, almost entirely mineral mix; many growers add limestone grit or gypsum to echo its native substrate. Give it bright light with a little shade from the fiercest afternoon sun, and a snug pot so the small root system is never surrounded by wet compost.
Water thoroughly only when the mix has dried right out, then wait, and keep the plant essentially dry and cool through winter to reduce the risk of rot. Because seedlings grow so slowly on their own roots, grafting onto a vigorous rootstock is a common way to bring young plants on quickly, after which they can be grown harder or re-rooted. See Watering and Repotting for general technique.
Propagation
Seed is the standard method, though germination and early growth test the grower's patience — seedlings are tiny and develop very slowly. Sow onto a warm, mineral surface kept humid, and be prepared to wait. Offsets are uncommon on typical plants, so vegetative increase is largely limited to grafting. See Propagation — seed for a full walkthrough.
Common problems
- Rot — the single biggest killer; almost always from overwatering, a slow-draining mix, or water sitting in the deep grooves and crown.
- Stalling — normal for the species; do not mistake its natural slowness for a problem and be tempted to overfeed or overwater.
- Pests — mealybugs (white fluff lodged in the areoles and grooves) and red spider mites (fine webbing, bronzed skin) are the usual culprits. See Pests and diseases.
See also
- Aztekium — the genus overview
- Aztekium ritteri — the long-known sister species
- Grafting · Soil and potting mix · Watering · Propagation — seed