Ryusen is an interesting Japanese Maple which has palmate foliage, yet it has weeping growth habit. The name 'Ryu sei', translates as "falling stars", developed in Kawaguchi City in 1990 by Kahuzara Kobayashi.
Ryusen (or Ryusei) is a unique Japanese maple of strictly weeping habit with typical palmte, not dissected leaves. It was found as a natural mutation of one whole plant in Japanese maple nursery in Kawaguchi City in 1990. Its founder Kahuzara Kobayashi named it Ryusen (flowing or falling water) whereas its former provisional name, in my view a little more accurate, was Ryusei(falling star). The patent was issued in 2008 as PP18501.
I purchased my first Ryusen graft from Ebay. Obviously, graft was so tiny, there's no way of knowing at that time, if my Rysen was true or another variety of Acer Palmatum. However, I wanted to try (As none of the reputable nursery had any Ryusen available). But unfortunately, that turned out to be an unknown species because leaves and the overall behavior looks different (even though this one also have the weeping behavior).
Acer palmatum ‘Ryu sei’ is an exciting new pendulous Japanese maple with palmate foliage and an amazing shape. A recent introduction from Kobayashi Nursery in Japan this small elegant tree adds a unique form with an exotic appeal to the landscape. The name 'Ryu sei', translates as "falling stars". In early spring ‘Ryu sei’ displays bright shades of chartreuse green. The beautiful chartreuse green new growth accents older growth with smooth dark green foliage throughout the summer months. An amazing fall color change highlights this weeping maple form. The ‘Ryu sei’ Japanese maple has autumn leaves that reach shades of bright reds to deep oranges.
This amazing small form of weeping Japanese maple is extremely pendulous. This unique shape makes it extremely malleable to the creativity of the gardener. By growing ‘Ryu sei’ grow to its typical form this tree reaches around 5-6 feet in 15 years. Staking a central leader can greatly change the form by adding height and unique branching. Your gardening creativity with ‘Ryu sei’ can be as big (or small) as your imagination allows. We have even seen ‘Ryu sei’ grown upside down from a hanging basket to add a new unique perspective to weeping Japanese maples.
The weeping ‘Ryu sei’ Japanese maple is very heat tolerant and durable. This elegant tree can handle full sun up to zone 8 and makes an excellent addition for zones 5-9. Yes, this vigorous tree does great with shade as well and brings amazing shape, color and texture. ‘Ryu sei’ is great for: container patio planting, bonsai and small garden areas. As a staked tree, ‘Ryu sei’ make a great focal point plants in the landscape. Add ‘Ryu sei’ to a bank to provide a unique cascading beauty or near a water feature to accentuate its graceful pendulous form.
However, leaves are definitely different and weeping behavior somewhat different as well. I imagine this was grown from seed, and not true to type.
I actually did get a true Ryusen at a local nursery later and that one showed most of the standard Ryusen behaviro
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