Koyamadani nishiki

Character & interest

The key feature of ‘Koyamadani nishiki’ is its sculptural foliage: instead of pointed lobes, the tips become clearly rounded as the leaves mature, resulting in a leaf silhouette that is very different from classic palmatums. The effect is especially visible on well-established branches.

Colours

• Spring : soft green to yellow-green, often with pink highlights or a slightly reddish edge on young leaves.

• Summer : green (often a deeper “emerald” tone depending on exposure).

• Autumn : yellow-orange to orange-red (variable depending on conditions).

Habit & vigour

Rather upright habit, moderate growth. The silhouette generally stays balanced, and the plant is easy to grow in a container.

Indicative size

As a guide: depending on sources and conditions, estimates range from about 1.8 m at around 10 years to more “garden” figures around 3–3.5 m at 10 years. Ultimately it can form a small tree, but growth is highly dependent on climate, soil and training.

Exposure

Bright partial shade or gentle sun. Good light helps highlight the texture and nuances, but it is best to avoid scorching sun and dry wind, especially in a container.

Origin & history

One source indicates it was discovered in Japan in the wild, in Shiga Prefecture.