The quick and convenient step by step guide to growing your Hollyhock Seeds! As its appearance suggests, Hollyhock (Alcea rosea) is a relative of the exotic hibiscus of the tropics. This plant grows best in full sun and rich soil and in a protected location. Check Out The Sacred Plant Co Seed Selection How to Grow Hollyhock from Seed! # 1 | Plant the hollyhock seeds after any chance of the last spring frost in your area. Plant in a spot with full sun and rich soil. # 2 | Pl