Woodland phlox
Phlox divaricata · Polemoniaceae
The gardener's calendar
Ideal time to plant woodland phlox: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Foliage
- Semi-evergreen to deciduous depending on climate
- Flowering
- Spring (April-May)
- Mature size
- 30–40 cm tall × 40–50 cm wide
- Growth rate
- Moderate
- Hardiness
- Very hardy (down to -20 °C)
- Origin
- Eastern North America
- Soil type
- Rich, well-draining, slightly moist
Care
Watering
Keep the soil regularly moist during growth and flowering, especially in the first two years. Reduce watering in winter, but don't let the soil dry out completely. Avoid wetting the foliage to prevent disease.
Light exposure
Place your divaricate phlox in partial shade, ideally beneath deciduous trees. It tolerates dappled light and appreciates protection from direct rays in mid to late afternoon, particularly in warm regions.
Soil preparation
Enrich the soil with compost or well-decomposed organic matter. Ensure proper drainage to prevent waterlogging. A slightly acidic to neutral pH is optimal.
Fertilization
Apply a balanced fertilizer in spring as growth resumes. A second light application after flowering can encourage branching. Avoid excess nitrogen, which would promote foliage at the expense of flowers.
Pruning and maintenance
Remove spent flowers to extend blooming and stimulate branching. In late winter, clean out dead or damaged stems. Light rejuvenation pruning every 3–4 years refreshes the clump.
Pests and diseases
Watch for powdery mildew in humid, stagnant conditions; improve air circulation. Slugs can damage young shoots. Excess soil moisture encourages root rot; maintain strict drainage.
Did you know?
Divaricate phlox was once called 'wild sweet william' by Native Americans of the Northeast, who used it in infusions. Its scientific name 'divaricata' means 'spread in rays,' referring to its delicately arranged flowers that open like stars above the spring foliage.
Where to buy it
Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.
Add this plant to my garden →Plants from the same family
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Tips generated and checked by Viridia — adapt them to your local climate.