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Native Wildflower · Easy

How to Grow Autumn Phlox

Phlox paniculata

Your complete guide to growing Autumn Phlox.

☀SunFull sun to partial shade (4-6+ hours)
💧WaterModerate; drought tolerant once established
🗺Zones4–8
📏Height2-4 feet
Autumn Phlox📷 Wikimedia Commons

When to Plant Autumn Phlox

Planting windows vary by USDA hardiness zone. Look up yours by ZIP code.

ZoneStart IndoorsDirect SowHarvest
Zone 4 — April – June —
Zone 5 — April – June —
Zone 6 — April – June —
Zone 7 — March – May —
Zone 8 — March – May —

Companion Plants for Autumn Phlox

✓ Good companions

Black-Eyed Susan

Complementary bloom times and heights, attracts diverse beneficial insects including predatory wasps

Coral Bells

Low growing companion that doesn't compete for light, helps retain soil moisture

Goldenrod

Blooms simultaneously to create pollinator hotspot, attracts beneficial predatory insects

Little Bluestem Grass

Provides structural contrast and wind protection, shallow roots don't compete with phlox

New England Aster

Blooms simultaneously, attracts beneficial pollinators and creates stunning fall color combinations

Purple Coneflower

Similar growing conditions, sequential blooming extends pollinator season, sturdy stems provide mutu…

Wild Bergamot

Both attract butterflies and hummingbirds, bergamot's aromatic oils help deter harmful insects

Wild Ginger

Ground cover that retains soil moisture and suppresses weeds around phlox base

✗ Keep away from

Autumn Olive

Aggressive invasive shrub that outcompetes native plants for nutrients and light

Black Walnut

Produces juglone toxin that inhibits growth and can kill phlox and most other plants

Tree of Heaven

Allelopathic compounds in roots and leaves inhibit growth of native wildflowers

Notes from the garden

A greener inbox, occasionally.

Seasonal planting ideas, useful tips and a little inspiration. No weeds.