2nd-year maturity. Alcea rosea. Hollyhock Chater's Double Mixture Seeds. Non-GMO, Perennial/Biennial. 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 inch tall hollyhocks bursting with huge 5-inch blooms. Chater's Double Mixture hollyhock seeds are a spectacular pick for in the back of the garden, along a fence, or lining the house. Chater's Double Mixture hollyhock is a hardy annual that thrives as a perennial in optimal gardens but will easily reseed itself each season for as long as you'll have it around. Approx 3,000 seeds per ounce.