Operculicarya decaryi
| Light | Bright light to full sun; more light gives tighter growth and better colour |
|---|---|
| Water | Regular in active growth, allowing the mix to dry between waterings; keep much drier during the deciduous winter rest |
| Soil | Fast-draining mineral-rich mix (see Soil and potting mix) |
| Temperature | Frost-tender; keep above about 10 °C, USDA zones 10–11 |
| Propagation | Seed, root cuttings, and hardwood cuttings; often propagated for bonsai |
| Toxicity | No significant toxicity widely reported; best kept away from curious pets and children |
Operculicarya decaryi is a caudiciform succulent tree from Madagascar in the cashew family (Anacardiaceae), prized for its thick, gnarled and corky trunk and its canopy of tiny glossy leaves. Slow-growing and naturally bonsai-like in proportion, it is one of the most popular of all succulent bonsai subjects, known in Madagascar by the common name jabily.
Description
Operculicarya decaryi develops a swollen, knobby trunk and a fat, tuberous root system that store water against the long dry season. The bark is distinctively rough and corky, breaking into raised warty knobs and fissures that give even young plants an ancient, weathered look — much of the plant's appeal. The branches are stiff and zig-zagging, carrying small, pinnate leaves made up of many tiny rounded leaflets that are deep green and slightly glossy.
The plant is deciduous, dropping its leaves during the dry season or when kept cool and dry, and flushing again when watering resumes. It is dioecious, meaning individual plants are either male or female, so seed set requires plants of both sexes; the small flowers are inconspicuous and are followed, on pollinated females, by little reddish drupes.
Distribution and habitat
The species is endemic to southern and southwestern Madagascar, where it grows in dry, deciduous spiny thicket and thornscrub on rocky and sandy ground. Here it endures a pronounced wet-and-dry seasonal climate: warm and humid during the short rains, then long, hot and arid — conditions that favour its water-storing caudex and its deciduous habit. In habitat it can grow into a substantial gnarled tree, though in cultivation it is almost always kept small.
Cultivation
Operculicarya decaryi is a rewarding and fairly forgiving caudiciform once its seasonal rhythm is understood. Grow it in a very free-draining, mostly mineral mix and give it as much bright light as you can — full sun suits it and produces the compact, characterful growth that growers want, whereas too little light causes lanky, weak branches and widely spaced leaves.
During the warm growing season water regularly but let the mix approach dryness between waterings; the fat roots and trunk resent sitting wet and can rot if the mix stays soggy. As the plant slows and drops its leaves for winter, cut watering right back and keep it warmer and dry — it is frost-tender and unhappy below about 10 °C. Feed sparingly in growth. Because the species is such a natural bonsai subject, many growers pot it in shallow containers, prune to shape, and progressively raise the caudex and roots at repotting to show off the trunk. See Watering and Repotting for general technique.
Propagation
Several methods work well. Seed is used where both male and female plants are available to set viable fruit; fresh seed sown warm on a mineral surface gives the most naturally fat-based, characterful plants (see Propagation — seed). Because the species is dioecious, seed is not always an option for a lone plant, so vegetative methods are common: both hardwood stem cuttings and, notably, root cuttings will take, the latter often producing thick, interesting bases. Cuttings tend to build a fibrous rather than a swollen root at first, so many growers favour seed-grown plants for the finest caudices. See Propagation — cuttings and Propagation — offsets for related technique.
Common problems
- Root and caudex rot — the main killer, caused by a slow-draining mix or by watering while the plant is cold or dormant; the trunk or roots soften and darken.
- Etiolation — in too little light the branches stretch, leaves space out, and the plant loses its compact bonsai character.
- Leaf drop — normal and expected going into the dry/cool rest, but sudden drop in the growing season usually signals overwatering, cold draughts, or a hard check to the roots.
- Pests — mealybugs (white fluff in the branch crotches and on roots) and spider mites in hot, dry, still air are the usual offenders.
See also
- Operculicarya — the genus overview
- Bonsai · Caudex
- Soil and potting mix · Watering · Repotting · Propagation — seed · Propagation — cuttings · Pests and diseases