Invasive Weed Field Guide - National Park Service

in many-stemmed, cane-like clumps. Stems: Tough and hollow, divided by partitions like bamboo. Leaves: Pale green or blue green, alternately arranged, up to 2 ft long. Leaves clasp the stem with a heart-shaped base and taper to tip. Flowers: Feathery plumes, up to 2 ft long. Roots: Large and spreading horizontal rootstocks. When does it flower? ................
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