Frankfurt – October 27, 2026 -- Gardeners who want new perennials next year can start sowing in the coming weeks. Many perennial species are cold germinators: their seeds carry a built-in germination block that only several weeks of cold can lift. Sown in fall, the seeds spend winter in the soil and sprout from spring, depending on the species, according to Germany's Industrieverband Agrar (IVA).