Also known as English primrose, primula or common primrose, primula acaulis is a spring bloomer available in a variety of bright colors, including yellow, red, brown, bronze, wine, blue or white, and in single and double varieties. A low-growing plant that tops out at 8 inches, primula is grown in shady woodland gardens, borders, mass plantings and containers. The plant, which prefers cool, humid climates, is suitable for growing in U.S. Department of Agriculture plant hardiness zones 5 through 9. rose