- You will get 120+ Seeds of Sweet Joe Pye Weed Wildflower Flower Seeds. - Sunlight: Partial Shade. - Life Cycle: Perennial. - Watering: Medium. - Sweet Joe Pye Weed, A butterfly favorite! Eupatorium purpureum is also known as spotted Joe Pye weed. Advanced grower level, difficult to germinate. Low germination rate is standard with this cultivar. - These TINY seeds grow into large 4-7 foot, beautiful plants. - Sweet Joe Pye Weed is easily grown from seed, its numerous tiny, vanilla scented, pinkish/purple flowers are grouped into huge, dome-shaped umbels that act like magnets for Monarchs, Swallowtails and many other butterflies! Its textured leaves are attractive all season long. Eupatorium purpureum is an excellent plant for the garden!. - Colour: Pink/Red. - Blooms: Mid to Late Summer. - Light: Full Sun to Part Shade. - Height: 3' - 6'. - Soil: Sand to Clay. - Water: Medium to Moist. - Cold, moist stratification can help increase germination success, but isn't a must. These seeds can be fall or spring planted. Seeds can be planted about (1/8 inch) deep in pots. Keep moist but not soggy and very warm (21 C - 70 F). When seedlings are (2 inches) tall, transplant into the garden spaced 1 foot apart.