Acer palmatum 'RYUSEN' (syn. 'RYUSEI')

Acer palmatum
Acer palmatum  'RYUSEN' (syn. 'RYUSEI')
Japanese maple
SIZE/TYPE small tree
LEAVES deciduous broadleaf
FLOWERS insignificant or non-blooming
LOCATION full to partial sun
SOIL TYPE acidic (peaty)
SOIL MOISTURE REQUIREMENTS evenly moist (dislikes drought)
USDA zone (lowest) 5   (down to -29°C)
FOR ZONE 5+6 Code of winter protection zone 5+6
FOR ZONE 7 Code of winter protection zone 7
BELONGS TO CATEGORIES Deciduous broadleaf
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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.

Leaves of Ryusen maple have 5 or 7 tips and really look like stars . They emerge bright green in spring and mature to medium green in summer. In autumn they turn rich shades of orange and fiery red. This maple variety is commonly grafted onto stems of various heights in order to achieve a tree-like appearance because once it reaches ground it creeps like a true groundcover which it is indeed.

Ryusen maple can take full sun all day long if sufficient irrigation is provided, and will also thrive in partial shade or in filterered sunlight. Grow it in semi-fertile, acidic to neutral, moist but well drained soil. Keep it mulched all year round and avoid growing grass above its roots. It will love a location with high air humidity, e.g. at a river bank or near a pond, but it is not a must. On the other hand it will definitely not be too happy in a small paved yard surrounded by dry air and hot concrete. Fully hardy to min. -29°C (USDA zone 5).

Last update 08-11-2016
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Acer palmatum  'RYUSEN' (syn. 'RYUSEI') height of stem 80 cm

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Acer palmatum (var. dissectum viride)
Acer palmatum
  • STANDARD QUALITY - Plants of this group are 1st class quality with number of branches and overall density adequate to their size and age, considering they were container grown.
  • DE LUXE QUALITY - This label guarantees a luxurious quality of manually selected plants that, compared to their height and age, are exceptionally dense and beautiful.
  • EXTRA - These plants are usually mature and bigger specimens with exceptional overall appearance.
  • STANDARD (as described in the plant form) means a tree with a trunk of 190-210 cm and a crown at the top, unless specified differently. The commercial size for trees is their girth measured in the height of 1m from ground.
  • HOBBY - These plants are of the same quality as our standard-quality plants but younger and therefore cheaper.
  • SHRUB - a woody plant with branches growing bushy from the ground level.
  • HALF-STANDARD or MINI-STANDARD - a small tree with shorter trunk, its size is usually specified.
  • FEATHERED - These are trees with branches growing already from the base of the trunk and up along the stem.
  • GRASSES and PERENNIALS - Sizes given usually read the diameter of the pot or the clump, as specified.
LARGE PLANTS over 150 cmspecimens, screening and hedging shrubs

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