 |
| Japanese knotweed flower cluster. |
 |
| Japanese knotweed foliage. |
| Similar weeds: Giant knotweed (P. sachalinense F.W. Schmidt) Differs by having a greater height and heart-shaped leaf base. |
|
Life cycle: Aggressive, clump-forming perennial.
Leaves: Alternate, broadly egg-shaped, sometimes heart-shaped with a squared leaf base.
Stems: Stout, semiwoody, red to brown, hollow and bamboolike, often exceeding 6 to 8 feet in height. Stems are also jointed, forming a zigzag growth pattern. A membranous sheath (ocrea) surrounds the stem at the base of each petiole. Reddish shoots arise from thick, sturdy and abundant rhizomes.
Flowers and fruit: Flowers are small, white to pink and borne in elongated clusters. The seed is enclosed in a single-seeded, shiny, dark brown to black, three-sided fruit.
Reproduction: Seeds and aggressive rhizomes. |
|
Christmas trees
