63-70 days to maturity. Lavatera trimestris. Rose Mallow Lavatera Seeds. Non-GMO, Annual. Rose Mallow seeds promise delicate and early blooms to your garden when other flowers can not. Rose Mallow seeds grow vigorous, frost-hardy lavateras that thrive in a wide range of cool and well-shaded North American gardens. Rose Mallow seeds are quick to mature into robust shrubby uprights dazzling with 3-4 inch open cup-shaped blooms in shades of white, creamy pink, blush, and rose. Rose Mallow seeds are an ideal annual ground cover to accent walkways and flowerbeds, but are most popularly grown freely among wildflower mixes and wide open spaces.