Emerald Blue Creeping Phlox: The Purple-Flower Ground Cover for Sun & Slopes

Phlox subulata 'Emerald Blue' forms a 6″ tall, 24–36″ wide mat of needle-like evergreen foliage smothered in blue-lavender (near-purple) star flowers from spring into summer. Zone 2–9 hardy, salt-tolerant, deer-resistant (rabbits love it though). The ultimate problem-solver for sunny banks, rock walls, and border edges.

Planting for Success

• Full sun = maximum flowers. Light shade tolerated but fewer blooms.
• Space 12–18″ apart—they'll knit together in 1–2 seasons.
• Well-drained soil essential. Amend clay with grit/compost.
• No tall neighbors that will shade it out later.

Care Calendar

• Water: Weekly first year; established plants only in drought.
• Weed: Hand-pull only—shallow roots damage easily.
• Fertilize: Early spring, general-purpose granular.
• Shear: After flowering, trim ⅓ to thicken foliage and encourage rebloom.

Fast Facts

• 61 Phlox species exist—subulata is the creeping/moss type.
• Colors: white, pink, purple, blue, bicolors.
• Spider mites in hot dry spells—blast with water.
• Propagate by division (spring or fall) or stem cuttings.

Plant a drift of 5–7 along a stone wall or slope edge. In two years, you'll have a living carpet that stops erosion, suppresses weeds, and stops traffic with color.