Acer tegmentosum Seeds | Manchurian Striped Maple
LATIN NAME: Acer tegmentosum
COMMON NAME: Manchurian Striped Maple
Plant Profile
Leaves are broadly ovate, usually three-lobed with a shallow upper pair, set on a heart-shaped base with a doubly toothed margin. Autumn turns the crown a clear yellow rather than crimson, which is one reason the tree is grown for winter stems as much as for foliage. Greenish-yellow flowers open in drooping racemes as the leaves expand, and the paired samaras spin away on the wind, each winged seed’s angle of attachment setting its autorotation.
In the mountain villages of Gangwon and the eastern uplands this maple is tapped in the same spirit as the sugar maples of North America. A shallow hole is bored at a gentle upward angle into a trunk of useful size while nights still freeze and afternoons begin to soften; a spout is set, a container hung beneath it, and the run collected over the short window when sap is moving. The hole is small, placed on a different face each season, and closes over with new wood.
The liquid is thin and only faintly sweet, so it is drunk fresh, chilled, or reduced a little to concentrate the flavour, and it is not a run that repays the fuel of boiling down. Tappers judge the flow by taste and by the colour of the first container, and stop when the sap turns cloudy and the buds break. Choose a trunk with a hand’s span of clean circumference, and never tap a tree still in the nursery row.
Science & Biotechnology
Chloroplast genomes have been assembled for a growing list of maples, and the markers that come out of them are used to sort out relationships inside section Macrantha, where the species look alike and hybridise where their ranges meet. Stands in Korea and northeast China have been screened with microsatellite and ISSR markers as a baseline for conservation planning, and the picture is of populations structured by mountain range rather than by distance alone. Provenance therefore matters commercially: seed from one valley can behave differently from seed two ridges away.
Maples multiply cleanly in vitro from nodal explants of young growth, established on a Murashige and Skoog base with benzyladenine to break axillary buds, then moved to a low-auxin medium for rooting. The technique matters because seedling batches vary in how well they stripe, and a stem with a fine unbroken white line is worth cloning rather than recomputing from open-pollinated seed.
Uses & Benefits
Each lane is a chain of lenticels, the porous patches that replace stomata once a stem thickens, stretched lengthwise along the internodes and packed closely enough to form an almost unbroken line. Because the surrounding bark stays thin and able to photosynthesise while the shoots are young, the trunk keeps a green cast that fades only after many seasons, when the pattern finally breaks into coarse plates. Cut a stem and the petiole and young bark release thin milky sap, the family habit that separates maples from the striped elders they resemble.
The stem and bark carry hydrolysable tannins of the gallotannin type, including acertannin-type compounds built on a glucose core, with simple organic acids and traces of flavonoids. In Korea the dried stem is sold for decoctions with a long reputation as a liver-supporting tonic, and published analysis concentrates on the gallic-acid derivatives that dominate the extract. The leaves hold a comparable tannin load and supply the yellow-brown dye once taken from these trees.
Growing from Seed
Sow in autumn, or stratify in damp sand in a cold frame and sow in early spring, just covering the samaras with a gritty, humus-rich mix. Pot the seedlings on as soon as the first true leaf pair has expanded and the samara wing has dropped, into a deep container, because the taproot wants length before width. Plant out at about knee height, in moist but never waterlogged soil, four metres apart.
Full sun suits the tree on cool sites, but a little afternoon shade prevents bark scorch where summers are hot. Young growth is the tender part, and a late frost in an exposed spot can blacken a whole flush, so plant where cold air drains away rather than pools. Aphids and scale colonise soft stems, waterlogged ground invites root and collar rots, and deer browse shoots hard enough to strip a young tree.
Our Take
Grow this maple hard for its first seasons, keep the lower stem out of harsh midday sun, and let the bark do the work. North American growers who like the stripe should look at Acer pensylvanicum, which bands itself in the same way, and at the Japanese snakebark Acer rufinerve. If sap rather than scenery is your interest, the older tradition belongs to Acer saccharum.
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