‘Arakawa’ is the original and most recognised rough bark Japanese maple — the name itself means “rough bark” in Japanese (ara = rough, kawa = bark). Among the hundreds of Acer palmatum cultivars, it is one of very few that develop corky, fissured bark resembling mature pine bark, a trait that adds trunk character, visual maturity and year-round interest that smooth-barked maples cannot match.

Young shoots emerge red, turning deep green or deep red depending on sun exposure. Around year four, the bark transitions to grey and begins cracking into the characteristic scales that define the cultivar. This progression deepens over the following years, creating increasingly pronounced texture. In open ground, Arakawa reaches 3 to 5 metres — a vigorous, upright grower with fast pace, long internodes and large leaves that support rapid trunk caliper increase.

What makes Arakawa particularly valuable for bonsai is the combination of bark character with strong development momentum. The trunk thickens quickly under open cultivation, and as the bark texture develops, wire marks become less visible over time — a practical advantage during structural training phases. Seasonally, the cultivar delivers understated spring colour (light green with red margins), stable summer green, and one of the most dramatic autumn displays among Japanese maples: deep orange and purple before leaf drop. For bonsai, informal upright and slanting styles suit it well, where the bark texture adds credibility to designs that suggest age and exposure.