Perennial weeds may or may not reproduce by seed. They always, however, have the potential to reproduce by vegetative means. Description of Hemp Dogbane Hemp dogbane has long, horizontal rootstocks that contain buds from which shoots emerge. The stems are 1 to 2 feet long and grow from a woody base. Leaves are erect, elliptical, narrow, and have smooth edges.
Leaves are bright green in the summer and turn yellow-brown in the fall.
Each flower produces 2 pods that are slender, sickle-shaped, and 2 to 4 inches in length. The plant can reproduce by seed, crown buds, and roots. Hemp dogbane may be found in cropland, pastures, fence rows, and waste areas. Seedlings become perennial within 6 weeks of emergence. Control of perennial weeds may require a combination of all these methods.