Creeping phlox
Also known as
Moss phlox, Moss pink, Mountain phlox
Keep this plant’s care guide close at hand.
Get the appAbout Creeping phlox
Phlox subulata, commonly called creeping phlox, is a low-growing, evergreen to semi-evergreen perennial prized for its spring carpet of blooms. Forming dense, needle-leaved mats only 4–6 inches (10–15 cm) tall, it spreads to cascade over walls, soften rocky edges, and stabilize slopes. In mid to late spring, masses of five-petaled flowers in white, pink, magenta, lavender, or blue smother the foliage, often with darker eyes; cultivars broaden the palette and bloom intensity. Native to the eastern and central United States, it thrives in lean, sharply drained, sandy or rocky soils and full sun, tolerating drought once established. The plant’s tight habit suppresses weeds and provides early nectar for bees and butterflies. It benefits from a post-bloom shear to maintain a compact cushion and encourage fresh growth and occasional summer rebloom. Creeping phlox spreads by rooting nodes where stems contact soil and is easily propagated by division or cuttings. Generally problem-free, it may suffer crown rot in poorly drained sites or spider mites in hot, dry conditions.
Taxonomy
Properties & Requirements
How to care for Creeping phlox
Water
Water regularly during the first growing season to establish deep roots—about 1 inch (2.5 cm) per week, depending on weather and soil. Once established, water deeply but infrequently, allowing the top 1–2 inches (2.5–5 cm) of soil to dry between irrigations. Avoid overwatering and never let the plant sit in soggy soil. Use drip or soaker hoses to keep foliage dry and reduce disease risk. In containers, check moisture more often and ensure excellent drainage; keep slightly drier in winter.
Light
Provide full sun for best flowering—at least 6–8 hours of direct light daily. In hot summer regions (Zones 8–9), light afternoon shade can prevent heat stress and prolong bloom. Too much shade leads to fewer flowers, looser mats, and increased disease susceptibility. On slopes or walls, ensure the sun reaches the foliage evenly to prevent thin patches. For container displays, place in the brightest outdoor location available; indoor culture is not recommended for this species.
Nutrients
Creeping phlox thrives in lean, well-drained soils and needs minimal feeding. In early spring, top-dress with a thin layer of compost and, if growth is sparse, apply a light dose of a balanced, slow-release fertilizer (e.g., 5-10-5 or 10-10-10) at half the label rate. Avoid high nitrogen, which encourages lush foliage at the expense of flowers. Do not fertilize in late summer or fall, which can prompt tender growth before winter. Container-grown plants benefit from a low-rate, controlled-release feed every spring.
Temperature
Hardy in USDA Zones 3–9, Phlox subulata tolerates winter lows near −30°F (−34°C) and summer heat when drainage is excellent. Ideal growing temperatures are 55–75°F (13–24°C). Winter wet is more damaging than cold; ensure sharp drainage to prevent crown and root rot. In hot climates, provide afternoon shade and occasional deep watering during extended drought. Avoid frequent, shallow watering in heat, which encourages shallow roots. Container plants may need protection from freeze–thaw cycles.
