Kiyohime maple

"Kiyohime" is the cultivar to reach for when you want a Japanese maple bonsai in shohin or mame size without waiting 20 years for leaves to reduce. The natural leaf size is 2–3cm versus 5–8cm on base palmatum — already in bonsai proportions on day one. Combined with a naturally spreading, almost horizontal habit and very short internodes, the cultivar produces bonsai-scale trees almost without intervention.

The habit is the defining feature. Where base palmatum grows upright, Kiyohime spreads horizontally — branches extend nearly parallel to the ground with minimal upward leader development. This sounds limiting for styling but in practice produces some of the most natural-looking small Japanese maple bonsai available. The cultivar suits root-over-rock plantings, semi-cascade compositions, and informal upright styles with a strong horizontal emphasis.

Spring colour is light orange to peach. The foliage transitions to green through summer and produces variable autumn colour — usually gold with red highlights, occasionally fully red on trees in good light.

Trunk development is slow — slower than base palmatum, slightly faster than Shishigashira. The cultivar is best used for medium to small bonsai where its natural scale is appropriate, rather than attempting to develop substantial trunks over decades.

Daily through the growing season. Kiyohime's small leaves and shallow root run mean it tolerates dryness less well than base palmatum — even brief drought scorches leaf margins.

In hot summer weather, twice daily for trees in shallow pots. Morning sun and afternoon shade suit the cultivar; afternoon shade is more important than it would be for vigorous cultivars because Kiyohime's small leaves desiccate faster.

In winter, regular but reduced watering. Use rainwater where possible.

Weekly half-strength liquid feed from late April through to mid-September. Slow-release organic pellets in spring and early summer.

Heavy feeding produces longer internodes and larger leaves — quickly losing the cultivar's natural scale. Restrained feeding suits Kiyohime better than vigorous cultivars.

Stop feeding by mid-September.

Free-draining and slightly acidic. Standard Japanese maple substrate.

Repot every 2 years on young trees, every 3 on mature specimens. The window is mid-February through to early April. Repot as buds swell.

Kiyohime's small root system tolerates moderate root work — up to a third of the root mass. The cultivar recovers reasonably quickly. Don't combine repotting with major pruning in the same year on small specimens.

Kiyohime pruning is essentially the same as base palmatum but the smaller scale means less aggressive cutting.

Structural pruning in late winter. Through the growing season, allow new shoots to extend to 3–4 leaves then cut back to 2. Pinch every two to three weeks. The cultivar's naturally short internodes mean pinching is more effective than for cultivars with long extensions.

A characteristic challenge: the apex of a Kiyohime tree tends to weaken over time because the cultivar's natural spreading habit favours lateral growth over apical. Keep the apex stronger than the lower branches in your pruning balance, otherwise it weakens and the tree loses height definition.

Defoliation works on healthy trees and produces dramatically refined second-flush foliage. The cultivar can take annual defoliation on vigorous specimens, biennial on more refined trees.

Wire after leaves harden in early summer or on bare branches in winter. Bark is thin — apply loosely and check fortnightly. Aluminium for almost all work; small-gauge for shohin specimens.

The naturally horizontal habit means much styling work involves preserving and emphasising the spreading branches rather than fighting them upward.

Informal upright with strong horizontal branching emphasis is the natural fit. Semi-cascade works particularly well — the cultivar's habit suggests this style without aggressive bending. Root-over-rock plantings are exceptional. Forest plantings of multiple Kiyohime produce dense low groves that look genuinely ancient at small scale.

The cultivar is among the few Japanese maples that suit a natural-looking miniature tree aesthetic without years of refinement work. Lean into this character rather than fighting it.

Cascade is possible. Formal upright and pure broom styles fight the cultivar's habit.

Hardy across most of the UK with no protection needed in normal winters. The cultivar's shallow root system makes it slightly more vulnerable to extreme cold than vigorous upright cultivars; in Scotland and exposed positions, light shelter in severe winters is sensible.

Never bring indoors.

Always grafted onto Acer palmatum rootstock. Cuttings rarely succeed. The graft union usually shows near the base — quality Kiyohime bonsai have the graft positioned low enough to be hidden or have been air-layered onto own roots.

Generally healthy. Inherits base palmatum's vulnerabilities but the small scale means problems are often less severe.