Blue vervain is a lover of wet meadows and riversides. It is a tall thin plant to around 6 feet with spikes of pale blue-purple flowers July-September. These flowers are very attractive to pollinators and later the seeds are often sought by goldfinches. Preference is for full sun and wet soil. Will tolerate clay! Zone 3-8. VA ecotype. // Seed packet, about 100 seeds. Germination requirements: 60 days cold, moist stratification.