Silver Sedum Rupestre Succulent Seeds - 350 Flower Rock Garden Seed Sedum rupestre ‘Silver’ is a drought tolerant, low-growing perennial with silvery, succulent, needle-like leaves. Great accent in mixed containers. Sedums grow best in well-drained, gravelly soil that is not wet in winter. Silver Stonecrop is heat & drought tolerant. Requires little water once established. Perennial, 2-6 weeks at 15-18oC, sow April-June. Sow anytime for indoor plant growing. Silver Sedum Rupestre Succulent Seeds - 350 Flower Rock Garden Seed