How to Grow Creeping Phlox
Phlox subulata
Creeping phlox is a mat-forming evergreen groundcover that erupts into a carpet of starry flowers in mid to late spring. Plant in autumn or spring in full sun and well-drained, even poor or sandy soil, spacing about 50 cm apart. The key task is shearing back by one-third to one-half immediately after flowering to keep the mat dense and prevent bare woody centres. Once established it is extremely drought-tolerant and virtually maintenance-free. Excellent for rock gardens, walls, slopes, and anywhere you need low, colourful ground cover.
Yearly Lifecycle
Care Essentials
Rarely needed. A light feed in early spring as growth resumes helps promote flowering. Avoid heavy feeding which causes leggy, loose growth at the expense of flowers.
Watch For
- Spider mites in hot dry weather
- Powdery mildew in humid conditions
- Crown rot in poorly drained soil
Companions
Aubrieta, Arabis, Dianthus, Sedum
Pet Safety
Care Requirements
Light
Full sun essential
Creeping phlox needs full sun for the densest growth and most prolific flowering. In shade it becomes sparse and open with far fewer flowers.
Watering
Drought-tolerant once established
Very drought-tolerant once established. Only water during extreme prolonged drought. Overwatering and wet soil cause crown rot and loose, open growth.
Fertilizing
Light feed in early spring only
A light balanced feed in early spring as growth resumes is sufficient. Avoid rich feeding which produces leggy growth at the expense of flowers.
Pruning
Shear back after flowering
Cut back by one-third to one-half immediately after flowering. This keeps the mat dense and prevents bare woody centres that develop in untrimmed plants.
Spacing
50 cm apart
Space plants 50 cm apart for ground cover. They spread to fill gaps within one to two seasons and will cascade over edges of walls and raised beds.
Support
No support needed
Creeping phlox is a low mat-forming groundcover that needs no support. It hugs the ground naturally and cascades over walls and slopes without assistance.
Growing Tips
Shear after flowering to keep it tight
Cut the whole mat back by one-third to one-half immediately after the flowers fade. This prevents bare woody centres and promotes dense fresh growth that may produce a few bonus blooms in autumn.
Thrives in poor soil
Creeping phlox actually performs better in lean, well-drained soil than in rich garden soil. Rich conditions produce lax growth with fewer flowers. Sandy or gravelly soil is ideal.
Perfect for slopes and erosion control
The dense root system and spreading habit make creeping phlox excellent for stabilising banks and slopes. Once established, the mat suppresses weeds and holds soil effectively.
Easy to propagate by division
Divide established clumps in early autumn or early spring. Pull apart rooted sections and replant immediately. They establish quickly and fill gaps within one growing season.
