Acer crataegifolium aka Hawthorn Maple

Acer crataegifolium is known as hawthorn maple or uri maple. It belongs to the soapberry family, Sapindaceae. This deciduous tree grows wild in central and southern Japan. Its range includes Honshu, Kyushu, and Shikoku. It grows beside streams and mountain paths in temperate woods. It also grows in young woods that follow earlier clearing.

In gardens, it forms a small tree or large shrub. North Carolina State gives a height and width of 15–20 feet [4.6–6.1 metres]. Other sources describe larger trees. Oregon State reports about 30 feet [10 metres] in height. RHS gives 26–39 feet [8–12 metres], with spread beyond 26 feet [8 metres]. Its branches may form an upright vase or spreading crown. White stripes mark the green to brown-green bark. The bark gives the bare tree interest in winter. New shoots mix green and red; buds are purple-red.

The simple leaves vary in shape and depth of lobes. Some lack lobes, while others have three. They range from dark green to blue-green, with paler undersides. Red tones may mark the upper surface and leaf stalks. Their edges have teeth. In autumn, leaves turn gold or orange before falling. Small flowers appear in spring, in clusters called racemes. Their colour ranges from pale yellow to yellowish white or green. Sources differ on whether these clusters stand upright or hang. Paired winged fruits, called samaras, follow the flowers. They begin pink or red and turn brown by autumn.

Give this maple fertile soil that stays moist but drains well. It accepts clay, loam, or sand across a broad pH range. Part shade suits it, though RHS also lists full sun. Strong sun and winter frost can crack the bark. Water during dry summer spells. Sources list USDA zones 6–8 and UK hardiness H6. The tree needs little pruning. RHS places any needed pruning between late autumn and midwinter. Oregon State reports that cultivation can be difficult.

Its bark and form suit winter gardens and small spaces. It also fits patio, Asian-style, and wildlife gardens. Moths use it as a larval host. North Carolina State reports no major problems. RHS lists aphids, mites, caterpillars, and scale as possible pests. Possible diseases include coral spot, Verticillium wilt, and honey fungus. Leaf scorch may also occur. PFAF records no known food or medicinal uses. It reports no known hazards, but this does not prove safety. Reported uses include bark paste for paper and leaves around stored crops.