Euphorbia neriifolia
| Light | Bright light to full sun; tolerates some shade |
|---|---|
| Water | Moderate in growth; keep drier and warmer through winter, allowing the soil to dry between waterings |
| Soil | Fast-draining, mostly mineral mix (see Soil and potting mix) |
| Temperature | Keep above about 10 °C; frost-tender, USDA zones 10–11 |
| Propagation | Stem cuttings (allow the cut latex to dry); seed less common |
| Toxicity | Caustic milky latex; irritating to skin, eyes and if ingested — treat as toxic to people and pets |
Euphorbia neriifolia is a spiny, upright tree spurge native to India and widely grown across tropical Asia, where it has long been used as a living hedge and in traditional gardens. It forms a stout, branching succulent trunk with five (sometimes more) spiralling angles lined with short paired spines, and fleshy leaves that appear near the growing tips. Common names include oleander spurge and Indian spurge tree. In the succulent hobby it is best known through its striking fan-shaped crested form, often sold simply as Euphorbia neriifolia cristata.
Description
Euphorbia neriifolia grows into a shrub or small tree, in time reaching several metres tall in the ground though staying far smaller in a pot. The green stems are thick and fleshy, marked by five low, spiralling ribs (older or vigorous plants may show more) that give the trunk a twisted, columnar look. Along the ridges sit pairs of short, sharp spines on small tubercles.
Unlike most desert spurges, this species carries conspicuous leaves — spoon-shaped to oblong, smooth and somewhat fleshy — clustered toward the branch tips. The leaves are seasonal, dropping in the dry season and flushing again with warmth and moisture. Flowers are the small, greenish cyathia typical of Euphorbia. Like all euphorbias, cut or broken stems bleed a white latex.
Distribution and habitat
The species is native to India and is naturalised and cultivated throughout tropical and subtropical Asia. It favours warm, seasonally dry situations on rocky or well-drained ground, and its toughness has made it a popular boundary and temple-garden plant far beyond its original range. Because it has been moved around by people for so long, its precise wild distribution is difficult to pin down.
Cultivation
Euphorbia neriifolia is an easy, forgiving succulent given warmth and drainage. Grow it in a fast-draining, mostly mineral mix in bright light to full sun; strong light keeps the growth compact and the ribs well defined. Water moderately while it is in active growth and leaf, then reduce watering as temperatures fall — through winter keep it warm and mostly dry, as cold wet roots invite rot. It is frost-tender and should be protected from temperatures much below about 10 °C.
The plant handles repotting and pruning well, but always work with care: the milky latex is caustic and can badly irritate skin and eyes, so wear gloves, keep it away from your face, and rinse any contact promptly. See Watering for general technique.
Propagation
Propagation is easiest from stem cuttings. Take a healthy branch, rinse or blot away the bleeding latex, and let the cut end callus and dry for several days to a couple of weeks before setting it in a dry, gritty mix; keep it barely moist and warm until roots form. Handle cuttings with gloves. Seed is possible but far less commonly used in the hobby. See Propagation — cuttings for a full walkthrough.
Crested and other forms
The most sought-after form in cultivation is the crest (cristata), in which the growing point fasciates into a broad, undulating fan rather than a normal round stem — the plant most people mean when they buy "Euphorbia neriifolia cristata". Crested and variegated spurges often grow more slowly and can be less robust on their own roots, so they are frequently grafted onto a vigorous rootstock to keep them growing strongly and to lift the delicate crest clear of the soil. Care otherwise follows the species. A crest may occasionally throw a normal branch, which is usually removed if the fan is to be preserved.
Common problems
- Rot — from cold, wet conditions or a slow-draining mix; the stem softens and discolours, often from the base. Keep it warm and drier in winter.
- Latex irritation — not a plant problem but a grower one: the sap stings skin and is dangerous to eyes. Always wear gloves and keep it away from your face and from children and pets.
- Etiolation — too little light produces thin, stretched, pale growth; move to a brighter spot.
- Pests — mealybugs (white fluff in leaf axils and along the ribs) and the occasional scale are the usual offenders. See Pests and diseases.
See also
- Euphorbia — the genus overview
- Grafting · Soil and potting mix · Watering · Propagation — cuttings · Repotting · Pests and diseases