Japanese knotweed plant spreads by rhizomes under the ground. Japanese knotweed plant grows best in damp areas, but will grow anywhere that their roots can find soil. They are about 6 to 8 inches (15-20 cm.) tall. Japanese knotweed flowers grow at the top of the plants, are cream colored, and grow straight up. The stems are hollow and have “knots” or joints every few inches (8 cm.). Japanese knotweed stems are the easiest to identify, as they also give it its name. The leaves are heart shaped and about the size of your hand, with a red vein running down their center. The Japanese knotweed plant ( Fallopia japonica) tends to grow in clumps and can grow up to 13 feet (4 m.) tall in the right conditions, but is often smaller than this. If Japanese knotwood has taken over a part of your yard, keep reading to learn more about how to kill Japanese knotweed. It is also like bamboo in that control methods for Japanese knotweed are almost the same as for controlling bamboo. While it may not be a true bamboo, it still acts like bamboo. Though Japanese knotweed plant looks like bamboo (and is sometimes referred to as American bamboo, Japanese bamboo, or Mexican bamboo), it is not a bamboo.
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