84-91 days. Supernova primula seeds promise delicate and early Spring blooms to your garden when others can not. Supernova seeds grow vigorous, frost-hardy primulas that thrive in a wide range of cool and well-shaded North American gardens. Primula supernova seeds grow compact, yet durable 8 inch tall creeping mounds dazzling with 2 inch blooms in a spectacular mix of salmon, fuchsia, canary, indigo, magenta, ivory, and peach. Supernova primula seeds are an ideal annual ground cover to accent any walkway, fencing, or flower bed.