Dahlia 'Black Jack' - 1 live plant potted or tuber bulb late fall to early spring. Huge 10" inch wide flowers, with petals of gold and ruby red tips. In a class of its own. Perennial; Grows up to 36 Inches Early to Mid Summer Blooming, Easy to Grow, Dark Purple almost Black Flowers Prefers Sun/Partial Shade Shipping Spring via Priority Shipping USPS (2-3 days) Zones 3-8 lift in fall or cover with heavy mulch.