Bolax gummifera (Balsam Bog, Cushion Plant)

Plant Profile

Bolax gummifera, known as Balsam Bog or Cushion Plant, is a remarkable, slow-growing, evergreen perennial from the Andes and subantarctic regions. It forms extremely dense, hard, cushion-like mounds of tiny, tightly packed, glossy green leaves. The cushions can become quite large over many years. Small, greenish-yellow flowers appear in summer. It is highly adapted to cold, windy, exposed conditions.

Key Characteristics

• Family: Apiaceae (ay-pee-AY-see-ee)
• Genus: Bolax (BOH-laks)
• Species: gummifera (gum-MIF-er-uh)
• Synonyms: Azorella trifurcata, Bolax glebaria

Growing Conditions

Full sun to part shade, cool, moist, very well-drained, gritty soil. Hardy in USDA zones 5–8. Requires cool summers; dislikes heat and humidity. Excellent drainage is critical.

Landscape Uses

Prized for alpine gardens, rock gardens, troughs, and as a curiosity. The dense cushions are firm enough to walk on. Very slow growing.

Maintenance

Virtually none. Protect from excessive winter wet. Do not fertilize heavily.