Garden Phlox plant profile
Phlox paniculata
A perennial flower for full sun.
Last updated .
When to plant
When to plant Garden Phlox
Garden phlox is a clump-forming perennial set out as a plant and propagated by division. Plant in spring once the soil is workable; NC State notes adequate spacing and stem thinning improve air circulation against powdery mildew, and stems are cut to the ground in winter.
The calendar shows this cited seasonal window as an approximate band. It does not convert the season into frost-adjusted dates.
Open Garden Phlox in my garden calendarShows the source-backed planting season, not frost-adjusted dates.
Growing conditions
- Sun
- Full sun
- Lifecycle
- Perennial
- Spacing
- 12 to 36 in apart
- Hardiness
- Zones 4a to 8bFind my hardiness zone
Common problems
Watch for these
Also watch for: phlox plant bug.
Evidence trail
Evidence behind this profile
Original extension and institutional publications behind the planting, care, and safety facts on this page.
- Phlox paniculata (Garden Phlox, Summer Phlox)
North Carolina Extension Gardener Plant Toolbox (NC State Extension). Supports general reference. Checked 2026-06-18.