Rigid spurge cuts a distinctive figure in the dry garden: fleshy blue-green leaves arranged in close spirals along upright stems, the whole clump holding its shape through heat and drought with the easy confidence of a plant that originated in the poor, rocky soils stretching from southern Europe to Iran and northwestern Africa. In spring, clusters of chartreuse-yellow star-shaped blooms appear above those spiraling leaves, the bracts brightening to near-neon in strong light. Come fall, the foliage shifts toward red and bronze tones that persist into winter, offering an unexpected second act for a plant most people associate only with its spring display.

At 1 to 2 feet tall and 2 to 3 feet wide, it fits naturally into rock gardens, coastal plantings, and xeriscape schemes where drainage is guaranteed and fuss is unwelcome. It self-seeds willingly, so deadheading after bloom keeps populations in check in cultivated beds. The milky sap is toxic and a skin irritant, so gloves are always sensible. Hardy in zones 7 to 11, though it tends toward shorter-lived performance in consistently warm winters.