Agapanthus Dark Purple, One Gallon Plant This variety of agapanthus has flowers with much darker purple color than some of the older varieties we've grown to love, giving a nice contrast when mass planted with a few light blue or white species. Great for rock gardens, borders, grouped under trees, or mass planted. Grows to about 4' tall and wide. Takes full sun or partial shade. Shipped potted in soil for best possible results. No major pest or disease problems. Average water and soil. Also great in containers. Hardy to USDA zone 7. With protection, will take more cold.