The Japanese Maple 'Ryusen' (Acer palmatum 'Ryusen', PP18501) is a remarkable weeping cultivar introduced in 2006 by hybridizer Kobayashi. Also known as 'Ryusei', this selection features a strong pendulous habit, creating a cascading waterfall of foliage.
Unlike many dissectum types, 'Ryusen' has palmate leaves (not deeply cut) that emerge bright green in spring, turn deeper green in summer, and often display brilliant orange-red tones in autumn. Its graceful, flowing branches make it a stunning focal point when staked or allowed to spill over walls and containers.
This cultivar is relatively fast-growing for a weeping maple and tolerates a range of conditions, though it thrives in partial shade with consistent moisture. Its unique form adds architectural interest year-round.

| Family: | Sapindaceae |
| Genus: | Acer |
| Species: | palmatum |
| Cultivar: | Ryusen |
| Additional cultivar information: | (PP18501, aka Ryusei) |
| Hybridized | by Kobayashi |
| Registered or introduced: | 2006 |
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