Japanese bamboo is not a true bamboo plant but an herbacious perennial that bears a striking resemblance, owing to its raised nodes and long, hollow stem. Also known as Japanese knotweed or Mexican bamboo, this plant is fast-growing, a tenacious spreader and is considered a weed in many areas. It is, however, an attractive plant and makes an effective flowering border.
Find a suitable location for the Japanese bamboo that has average or slightly acidic soil with full sun, although Japanese maple is shade-tolerant and able to adapt to other conditions.
Plant the seeds under a thin layer of soil in early spring after the last frost or bury a segment of root about 4 inches underground.
Water the Japanese knotweed regularly, keeping the soil moist but not wet. The plant is somewhat drought resistant but prefers wetlands and other places with abundant water.
Allow the Japanese bamboo to die off at the end of the year. It will naturally spread and regrow with the next growing season.