Hollyhock Seeds - Chaters Double Mixture2nd Year Maturity. Chater's Double Mixture hollyhock seeds promise to turn any stale bedding into a sensational and eye catching garden this season. Chater's Double Mixture seeds promise hardy 72 96 tall hollyhocks bursting with huge 5 blooms in shades of pink, red, rose, yellow, copper, scarlet, white, purple, and maroon. Chater's Double Mixture hollyhock seeds are a spectacular grow in the back of the garden, along a fence, or lining the house.