Koto maru
‘Koto maru’ is a dwarf Japanese maple—very dense and very slow-growing—originating from a witch’s broom mutation. It is recognised by its small leaves, whose central lobe is often shorter and rounded, giving a very distinctive look. In spring, the foliage starts yellow-green with bronze to orange-red edges, then turns green in summer. In autumn, it colours mainly yellow to orange, sometimes finishing with a redder touch. Perfect for containers and small spaces.
Character & interest
‘Koto maru’ is a texture cultivar: small leaves, often a little “rounded” in the centre, and tight branching. The plant forms a compact little shrub, very decorative near a path. Its interest is at its best in a container, where you can fully enjoy the foliage details and the very dense silhouette.
Colours
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Spring : yellow-green with bronze/orange to reddish edges on young leaves.
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Summer : green (often deeper), sometimes with pinkish nuances on new shoots depending on conditions.
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Autumn : yellow to orange; some reports mention a hint of red at the end of the season.
Habit & vigour
Very compact, dense habit; very slow growth (dwarf). The plant naturally stays “ball-shaped” or like a small cushion, with a structure that is easy to maintain.
Indicative size
As a guide: often stated around 0.5 m at 10 years in some collections, but other sources indicate 0.6 to 0.9 m (or even up to ~1 m) depending on conditions and training. Consider this variable (container vs in-ground, plant vigour, climate).
Exposure
Bright partial shade or gentle sun. Good light enhances the spring colours, but it is best to avoid scorching sun and dry wind, especially in a container.
Origin & history
‘Koto maru’ is presented as a Japanese cultivar, originating from a witch’s broom-type mutation.
| Groupe MS | 17. Witches Broom |
|---|---|
| Habit | Globulaire |
| Vigueur | Lente |
| Taille 10 ans | Nain (<1m) |
| Forme de feuille | Palmate |
| Couleur Printemps | Vert bordé rouge |
| Couleur Été | Green |
| Couleur Automne | Jaune / Orange |
| Exposure | Mi-ombre |
| Size / Grade | C1, C1.5, C10, C2, C3, C5, C7.5, P9 |
