Perennial Hosta: Timeless Beauty Every Season Hardiness zone.3-9 Grow.Sow seeds in cell packs or 2 in. pots, press into soil, barely cover. Kept at 60F, germination usually occurs within 4-5 weeks. If not, put container inside a zip-lock bag and refrigerate for 4 weeks. Ture.Hostas can have blossoms that are white, cream, pink, pale blue, lavender, or purple. There are even a few cultivars that have red or yellow flowers. Sun.Indeed, they languish in the hot afternoon sun so your shady landscape will provide them just the right conditions. Self-seeding.Grow from seed and enjoy growing with your family.