Drawings of purple loosestrife showing seed, seed capsule, calyx, flower, seedling, young plant (1-2 yrs), mature plant (3-5+ yrs), rootstock.

• Mature plant height 0.5-2.5 m (20-100 in)
• Petals 5-6 readdish purple
• Flowers in axils of bracts or leaves
• Stiff, four-angled stem (9-20 mm dia)
• Leaves sessile (3-10 cm)
• Dead stem from previous growing season
• Perennial rootstock (2 yr. old plant)
• Opposite leaves in two ranks