Neobuxbaumia scoparia
| Light | Full sun to bright light; acclimatise gradually to avoid scorch |
|---|---|
| Water | Moderate in warm growth, sparing in winter; always let the mix dry out between waterings |
| Soil | Fast-draining mineral-rich mix (see Soil and potting mix) |
| Temperature | Warmth-loving; protect from frost, roughly USDA zones 10–11 |
| Propagation | Seed (primary); branch cuttings |
| Toxicity | Not known to be toxic to cats or dogs |
Neobuxbaumia scoparia is a tall, slender-branched columnar cactus native to the dry forests of Veracruz and neighbouring parts of eastern Mexico. Mature plants develop a distinct trunk topped by a broom-like cluster of narrow, upright green stems, a habit that gives the species its name (scoparia meaning "broom-like"). It belongs to the small Mexican genus Neobuxbaumia, a group of stately tree-forming cacti closely allied to Cephalocereus.
Description
Neobuxbaumia scoparia is a tree-like cactus that in age forms a well-defined woody trunk and a crown of many slender, erect branches, reaching several metres tall in habitat. The stems are relatively thin for a columnar cactus, ribbed, and clothed in short spines borne on closely spaced areoles along the ribs. The overall silhouette — a bare lower trunk carrying an upswept cluster of green columns — is what distinguishes it at a glance from stouter relatives.
Flowers are borne near the branch tips; they are relatively small and reddish, and are followed by small fleshy fruits. Individual blooms are short-lived and easily missed.
Distribution and habitat
The species grows in the seasonally dry forest and thornscrub of Veracruz and adjoining regions of eastern Mexico, where it experiences a warm climate with a pronounced dry season. Plants root in well-drained, often rocky or gritty ground among other drought-adapted shrubs and trees, receiving strong light through the open canopy.
Cultivation
Neobuxbaumia scoparia is an undemanding grower where warmth and drainage are provided, though its eventual size makes it better suited to large containers or frost-free garden beds than to a crowded windowsill. Plant it in a very free-draining, mostly mineral mix and give it as much light as you can, acclimatising young plants gradually so the tender growth does not scorch.
Water moderately through the warm growing season, always allowing the mix to dry out before watering again, and keep the plant much drier and cooler over winter to prevent rot. It resents both cold and prolonged wet feet; protect it from frost. See Watering and Repotting for general technique, and Pests and diseases for routine health checks.
Propagation
Seed is the usual method: sown on a warm, mineral surface kept humid, the seed germinates readily, though seedlings are slow in their first years. Established plants can also be grown from branch cuttings — allow the cut end to callus for a week or more in a dry, shaded spot before setting it in a gritty, barely moist mix to root. See Propagation — seed and Propagation — cuttings for full walkthroughs.
Common problems
- Rot — the most frequent cause of loss, almost always from overwatering, a slow-draining mix, or cold wet conditions; stems soften and discolour from the base.
- Etiolation — too little light makes the slender stems stretch, pale and grow weak, spoiling the plant's upright form.
- Cold damage — this warmth-loving species scars or collapses if exposed to frost.
- Pests — mealybugs (white fluff in the areoles) and red spider mites (fine webbing, bronzed skin) are the usual offenders.
See also
- Neobuxbaumia — the genus overview
- Soil and potting mix · Watering · Propagation — seed · Propagation — cuttings · Pests and diseases