Showy Milkweed Seed Balls for Spring Planting (Asclepias speciosa) (50) Increased seed quantity, fresh seed, and improved moisture retention, for improved germination. 3 varieties of compost: traditional, bokashi, and vermicompost. Natural, unrefined iron-rich clay protects seeds from foraging animals. No-heat drying increases germination rate and seedling vitality. Provides nutrients and retains moisture for better germination and growth. Milkweed and most perennial wildflowers need to over-winter in the ground before they germinate. A 1/2" diameter seed ball for planting in the Spring