Cushion Spurge

Overview

• Botanical name: Euphorbia polychroma (synonym E. epithymoides) — commonly called Cushion Spurge. 

• Habit: Forms a compact, dome or cushion‐shaped mound roughly 12–18 inches tall and 12–24 inches wide in typical conditions. 

• Key features: In spring, bright sulphur‐yellow to chartreuse bracts (not true petals) top the mound. The foliage then persists through summer, and in fall the leaves may turn reddish, burgundy or orange, offering multi‐season interest. 

• Tolerances: Drought‐tolerant once established, deer and rabbit resistance noted. 

• Caution: All parts contain milky sap which may irritate skin and eyes; use gloves when handling. 

Light & Site Requirements

• Sunlight: Best in full sun (6+ hours/day). In hotter regions, some afternoon shade is beneficial to maintain foliage color and shape. 

• Soil: Prefers well‐drained soil, tolerates poor soils (sandy, rocky, low fertility) very well. Avoid sites that stay soggy or where water collects around the crown. 

• Drainage & location: Excellent drainage is essential; poor drainage is the most common reason for failure. 

• Spacing: Allow about 12–18 inches (30–45 cm) spacing to let the plant form its cushion habit and maintain good airflow. 

Watering & Maintenance

• Establishment (first season): Water regularly while roots develop; aim to keep soil moderately moist but not waterlogged.

• Once established: Tolerates drought; reduce watering and let soil dry somewhat between waterings. 

• Pruning / Deadheading: After flowering in spring, you may remove spent flower heads or cut back by about one‐third to maintain shape and reduce self‐seeding. 

• Division: Only occasionally needed; plant doesn’t like to be moved frequently. Divide in spring if it becomes large or the centre opens up. 

Cold‐Climate / Zone 3 Considerations

• While many references list hardiness as Zones 4–8, with the proper site (full sun, excellent drainage, sheltered from heavy winter moisture) Cushion Spurge can succeed in Zone 3 gardens.

• Important: avoid low spots that collect melt‐water, ensure soil is free‑draining, and consider light mulch after freeze if site is exposed.

• Because of its drought tolerance and low maintenance, it’s a strong performer for prairie/sun‐intense landscapes.

Photo from gardenia.net