Jade plant bonsai

Placement

In temperate climates, the jade plant is grown indoors; where it is warm all year, it can live outside in full sun. Set it by the brightest window, ideally facing south or west, where it gets several hours of direct sun. When light is sufficient, the leaf tips or edges turn red. In low light it survives but does not thrive: shoots stretch, leaves grow larger and drop more easily, and the miniature silhouette is lost.

In the warm season, a stay outdoors makes growth more vigorous and dense. Acclimate it gradually to full sun to prevent sunburn; in very hot climates, shield it from the harshest hours. Bring it in before the first frost: it can survive a light frost, but a hard freeze kills it, and it is best never to let it drop below 41 °F. Indoors it likes days of 64–75 °F and cooler nights, around 50–55 °F. In winter, keep the foliage away from cold windowpanes and chilly air currents.

It likes stability: a sudden temperature change or a move can make it shed leaves. If that happens, check the mix and the light first, since the same symptom can have several causes.

Watered correctly and given enough light, it usually stays healthy. Watch for mealybugs, white cottony clusters that distort new growth: remove them with a cotton swab dipped in rubbing alcohol, repeating for several days in a row. Spider mites, scale and aphids can also appear; insecticides can burn the fleshy leaves. The plant is toxic to dogs, cats and horses (see the jade plant page).

Soil mix

Like any succulent, it fears suffocated roots: the mix must drain very fast and stay airy, and the pot must always have holes. A standard bonsai mix works, sifted to remove the dust that slows drainage; its usual components are akadama, pumice and lava rock, while potting soil on its own holds too much water. A cactus mix lightened with perlite or coarse sand is another option. Choose a stable pot: the water-filled canopy is heavy, and a pot with too narrow a base can tip over in the first gust of wind.

Watering

Leaves, trunk and branches store a lot of water: water infrequently, but thoroughly. Let the mix dry out almost completely, water until it runs from the drainage holes, then empty the saucer. How often depends entirely on conditions: in warmth and bright light, the mix dries quickly; in cool or shady spots, it stays moist for a long time. Rather than following a schedule, feel the mix with a finger and watch the leaves, without wetting the foliage.

Soft or wrinkled leaves mean the reserves are running low: water deeply and watch for recovery. If they wrinkle while the mix is still wet, the roots are probably suffering from overwatering, which is far more dangerous for this species than underwatering: it leads to root rot and leaf drop. Kept cool in winter, the tree drinks very little.

Fertilizer: a balanced fertilizer about once a month from spring through fall, none in winter. Keep it light: too much produces soft, leggy growth and builds up salts in the mix.

Pruning

Pruning is the main shaping tool. The jade plant takes it very well: two buds usually appear right below the cut. Prune regularly to make it branch, especially low on the trunk. In spring, shorten stems just above a ring (a node scar) or a side branch; during the season, pinching the tips of new shoots keeps the canopy compact.

Never apply cut paste: the water-filled wood rots easily and wounds need to dry in the open air. Keep a freshly pruned tree out of the rain, and do not prune in fall a tree that spends the wet season outdoors.

To thicken the trunk, let it grow freely for a few years before cutting it back; growth is fairly slow, but steady in warmth and light. The pruned pieces make cuttings: let them dry for a few days, then set them on a dry, fast-draining mix. They root most easily in summer.

Wiring

The bark is very soft and wire marks it quickly. If you wire, use aluminum wire about one third the thickness of the branch, wound at roughly 45°, and check it often so you can remove it before it bites in; light wiring after pruning is usually enough. For thick or brittle branches, use guy wires instead, protecting the bark with rubber where they pull. Pruning remains the safest method: cut just above the bud that points in the right direction. The weight of stored water also bends branches down naturally, which helps create the look of an old tree.

It suits many styles: informal upright with a single trunk, group planting, mame (miniature) or literati for slender, lanky plants. As they thicken, the trunk and branches crack the bark, giving it an aged look, and the nebari (the flare of surface roots) develops as on other bonsai. Do not confuse it with Portulacaria afra, sold as “dwarf jade”: its leaves are smaller and it takes wiring better.

Repotting

Repot about every other year, in spring as growth resumes, into fresh fast-draining mix. The tree tolerates being root-bound: a pot full of roots is not an emergency. If you keep the same pot, lightly trim the roots and shorten the stems a little to keep things in balance.

Key point: do not water for about a week. Cut or damaged roots need to dry and callus over; watering right away encourages rot. Let the tree recover out of the rain, and wait about four months before feeding again.