Streptocarpus saxorum 'Concord Blue' also known as the Concord Blue cape primrose plant only grows to a height of 6-12 inches, but it can spread wide to about 12 inches. The flowers on streptocarpella saxorum grow to about an inch long with a slanted tube running down the center of them. Most streptocarpella saxorum flowers bloom with purple colors, but there are some blue varieties as well. It is usually grown in hanging Baskets, containers and window boxes. Streptocarpella saxorum can also be grown outdoors in the right conditions. Regions with excessively cold winter months will likely prove to be too much for this delicate plant. It prefers warm, humid environments to grow and prosper.