Annual, or weak perennial that may survive winters in moderate climates. Seeds germinate from November into spring, and plants become mature from late spring into the early fall. Prostrate knotweed differs from other knotweeds by its very low-growing habit, forming a dense mat on the surface of the soil. In cultivated fields the stems may begin to grow upright, standing even as high as 12 inches.
A problem weed in any soil environment, thriving in hard, dry soils along roadsides and waste places, as well as in well irrigated landscape and turf situations. The extremely tough roots make it a difficult weed to remove physically. Knotweed can be discouraged from growing if soil compaction is minimized, and if compacted soil is loosened or aerated. Dense turf will restrict its growth.