Tamukeyama Japanese Maple (Acer palmatum var. dissectum ‘Tamukeyama’)

Last updated: November 3, 2026

Acer palmatum var. dissectum ‘Tamukeyama’, the Tamukeyama Japanese Maple, is a weeping, cascading cutleaf cultivar prized as one of the oldest Japanese maple cultivars still in cultivation, with a history that traces back centuries in Japan. Its finely dissected, deep red-purple leaves drape over a dense, mounding framework of branches, and it is widely regarded as one of the most heat- and sun-tolerant red laceleaf cultivars available, holding its color notably better through summer than many younger weeping red selections.

Gardeners choose Tamukeyama for its combination of old-world pedigree, vigorous growth for a dissectum type, and dependable color. It typically grows faster and larger than many other weeping red cutleaf cultivars, which makes it a good choice where a bolder cascading specimen is wanted sooner rather than after decades of slow growth.

Japanese maple (Acer palmatum) is not native to North America — the species is native to Japan, Korea and eastern China — and Tamukeyama is an introduced, cultivated selection of it. It is not on federal noxious-weed lists. As a dissectum (laceleaf) form, it sets relatively little viable seed compared with full-size, broad-leaved cultivars, so escape into wild areas is uncommon; even so, avoid planting it directly against natural woodland edges and remove any stray seedlings you find nearby.

Identification

Tamukeyama grows as a dense, cascading mound, generally wider than tall at maturity, with a more vigorous, somewhat looser habit than some other weeping red dissectum cultivars.

Bark & Stems

Young branches are slender and reddish, aging to gray-brown bark; the fine, arching branch structure is attractive in winter once the leaves drop, showing the cascading form clearly.

Leaves

Leaves are deeply dissected into narrow, feathery lobes, giving a lacy texture typical of dissectum cultivars. New growth is a deep red-purple that is notably resistant to fading or “greening out” in summer heat compared with many other red laceleaf selections, a trait that is one of Tamukeyama’s main distinguishing features; color deepens to crimson-scarlet in fall.

Flowers

Small, inconspicuous reddish-purple flowers appear in spring, mostly hidden within the dense cascading branches and pollinated by wind and small insects.

Fruit & Seeds

Small winged samaras follow the flowers in modest numbers; like other dissectum forms, Tamukeyama produces less seed than full-size, broad-leaved cultivars.

Origin & Where It Grows

Acer palmatum is native to the forests and mountain slopes of Japan, Korea and eastern China. Dissectum, or threadleaf, forms have been grown and prized in Japanese gardens for their lacy, cascading foliage since long before Western horticulture adopted the species.

Tamukeyama is often cited by maple specialists and nursery sources as one of the oldest named Japanese maple cultivars still in commercial cultivation, with a history reported to extend back to the early 1700s in Japan, making it a genuine heirloom selection among dissectum cultivars; exact dating this far back relies on historical nursery records and should be read as approximate.

In U.S. gardens, Tamukeyama performs well across USDA zones 5 through 8, and its above-average heat and sun tolerance for a red laceleaf cultivar makes it a particularly good choice in warmer parts of that range — the Mid-Atlantic, Midwest, Pacific Northwest, and the upper and middle South.

Growing & Care Guide

Light

Tamukeyama tolerates more sun than most other red dissectum cultivars while still holding good color, making full sun to part shade workable in most climates; in the hottest regions, afternoon shade still helps prevent leaf edge scorch.

Soil & Water

Plant in rich, well-drained soil and keep it evenly moist, especially while young; established plants handle brief dry spells better than many dissectum cultivars but still benefit from consistent water during drought, since the finely cut leaves dry out quickly.

Planting Tips

Choose a site with some shelter from strong wind, which can tatter the fine foliage. Plant at the same depth as the nursery container in spring or fall, and allow generous room to the sides for its wide, spreading mature spread.

Pruning & Maintenance

Prune while dormant in late fall or winter to limit sap bleeding, thinning crowded or crossing interior growth to maintain the open, cascading silhouette. Because it grows a bit more vigorously than many other weeping dissectum cultivars, it may need slightly more regular shaping to keep a tidy form.

Propagation

Tamukeyama is propagated commercially by grafting onto upright seedling rootstock, which is also how it is trained into a weeping “standard” form on a straight trunk. Cuttings and seed-grown plants do not reliably reproduce its exact color, vigor and form.

Landscape Uses

• Specimen or focal point in a Japanese-style or courtyard garden
• Rock gardens and raised beds, where the cascading habit drapes attractively over stone
• Near water features, echoing the movement of water with its weeping form
• Container growing on patios, with winter root protection in colder zones

Wildlife & Ecological Value

Tamukeyama offers modest wildlife value. Its spring flowers attract some pollinating insects, and its dense branching provides cover for small birds, but relatively few native insect species use Acer palmatum as a host plant, so it does little to support native caterpillars and other insect larvae compared with a native tree. Enjoy it as an ornamental specimen and rely on native plantings elsewhere in the landscape for stronger wildlife support.

Native Alternatives

For a native plant with a similarly graceful or cascading look, consider:

• Vine maple (Acer circinatum) — a native with arching, multi-stemmed branches and good fall color
• Rocky Mountain maple (Acer glabrum) — a compact native maple for western gardens
• Red maple (Acer rubrum) — for bold native red fall color, though a much larger tree
• Bigtooth maple (Acer grandidentatum) — drought-tolerant with strong orange-red fall color
• Fringetree (Chionanthus virginicus) — a native small accent tree with fragrant spring flowers

History & Uses

Among dissectum Japanese maple cultivars, Tamukeyama stands out for its age: nursery and maple-specialist sources commonly trace it back to the early 1700s in Japan, which would make it one of the oldest named Japanese maple cultivars still grown anywhere today. For centuries it was valued in Japanese gardens for its cascading form and fine, lacy foliage, qualities that still define the plant.

Tamukeyama was introduced to Western horticulture as collectors and nurseries sought out historic Japanese maple selections, and it has since become one of the most widely available heirloom weeping red cultivars in the American nursery trade, often recommended specifically for gardeners who want a vigorous, reliable red laceleaf maple with a genuine historical pedigree.

Beyond ornamental landscaping and container use, Tamukeyama has no significant food, medicinal or timber value.

Frequently Asked Questions

Is Tamukeyama Japanese maple native to North America?
No. Acer palmatum is native to Japan, Korea and eastern China. Tamukeyama is a centuries-old cultivated selection of that introduced species, not a North American native plant.

How old is the Tamukeyama Japanese maple cultivar?
Nursery and maple-specialist sources commonly date it to roughly the early 1700s in Japan, making it one of the oldest named Japanese maple cultivars still in cultivation, though exact historical dating should be treated as approximate.

How big does Tamukeyama Japanese maple get?
Typically 6 to 10 feet tall and 8 to 12 feet wide at maturity. It grows somewhat faster than many other weeping red dissectum cultivars, so it can reach a substantial size sooner.

Does Tamukeyama hold its red color in summer?
Yes — it is particularly well known for resisting the fade to bronze or green that affects many other red laceleaf cultivars in summer heat, making it one of the more sun- and heat-tolerant choices in this group.

Is Tamukeyama Japanese maple invasive?
It is not listed as invasive federally, and as a dissectum cultivar it sets relatively little viable seed compared with full-size, broad-leaved Japanese maples, so it is unlikely to spread into wild areas.