Reynoutria japonica Seeds | Japanese Knotweed
LATIN NAME: Reynoutria japonica
COMMON NAME: Japanese Knotweed
Plant Profile
Among the ornamental and useful plants raised from seed, Japanese Knotweed (Reynoutria japonica) stands out as a vigorous, clumping, perennial. It spreads quickly by deep rhizomes into a bold stand, and it stands cold winters and deep, moist soils well. Give it full sun and deep, fertile ground. The blooms are worked steadily by bees for as long as they are open. In combination, these characteristics make a persuasive case for growing it.
Science & Biotechnology
Within the Reynoutria group, Reynoutria japonica is of continuing interest to researchers working on plant diversity, seed biology and the selection of improved garden forms. Japanese knotweed has an exceptionally rich and divided record in research. The practical point for growers is that this plant has been observed in gardens for so long that its behaviour holds few surprises.
Uses & Benefits
Japanese Knotweed brings genuine presence to the garden and earns its keep across the growing season. Ecologically, Japanese knotweed is a divided story. Its economic value is real and surprising. Young shoots are eaten as a vegetable, plant is valued by beekeepers for its late-season nectar, and its roots and stems contain compounds, including resveratrol, that are used in supplements and studied in medicine. Mature plants need little attention in a well-chosen position.
Japanese knotweed root, Hu Zhang, is a major Chinese herb and one of the richest natural sources of resveratrol, the red-wine polyphenol studied for cardiovascular and longevity pathways; as a garden plant it is famously vigorous, so containment matters.
Growing from Seed
Japanese Knotweed grows readily from seed. Growing Japanese knotweed from seed is easy, and it is a fascinating plant to grow for its edible shoots and its value to bees. Small, triangular seeds do well in warm, moist conditions, so sow them in spring in pots of seed compost, cover them lightly, and keep them warm, bright and evenly moist. A simple routine works well: sow evenly over the surface and cover lightly in a loose, well-drained seed compost, maintain even moisture, and provide full sun. Grow the youngsters on steadily in pots until well rooted, then move them to their final positions.
Our Take
Japanese Knotweed repays a little patience at sowing time with plenty of garden presence later.
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