84-91 days. Double Mixed Shirley poppy seeds are a classic summertime treasure. Double Mixed seeds promise delicate and papery 2" bicolored carmine poppy blooms stemming from 20-30" tall frost tolerant greens. Double Mixed Shirley poppies can be broadcasted directly in the garden just like wildflowers or grown in planters to show off indoors or up on the patio. Double Mixed Shirley poppies are easy to grow from seed and a perfect, low-maintenance grow for kids or busy or novice gardeners.