Description
Purple Knight Joseph’s Coat is a colorful Alternanthera grown primarily for its deep purple to nearly black foliage. Its branching, spreading habit typically reaches about 6–12 inches tall and 12–20 inches wide, creating bold contrast in sunny beds, edging, and mixed containers. Small pale flowers may appear but are not its main ornamental feature.
Growing Purple Knight in Alabama
Plant after the last spring frost in full sun for the richest foliage color. Use well-drained soil and water regularly while plants establish; once rooted, water when the upper soil begins to dry. Trim or pinch growing tips as needed to encourage a dense, tidy mound. A modest feeding during active summer growth is generally sufficient.
In most of Alabama, treat Purple Knight as a warm-season annual because frost can damage or kill the plant. Container plants can be moved into a bright, protected location before cold weather.
