Euphorbia rigida, Spurge

In a word: geometric! This evergreen clump-forming spurge has stiff, pointed silver leaves and arresting acid-yellow flowers in spring. Mature flower heads and leaves can turn a beautiful coral as we move into fall. Perfect for a dry garden foreground.  To maintain a tidy shape, cut back after early spring bloom, otherwise, enjoy its sprawling habit.  Mature size: 2 ft T x 2-3 ft W; spreads by seed. Minimum temperature: -10° F