Perennial
Garden Phlox
Phlox paniculata
Varieties We Carry
Super Ka-PowPhlox paniculata
Sizes & Pricing
1 galFrom$6.95
Fresh this week. Last restocked Mar 4.
LightPart Shade preferred; Full Sun with afternoon shade
WaterModerate to High
Mature size2-4 feet × 2-3 feet
About Garden Phlox
Garden Phlox (Phlox paniculata) bears large, fragrant domed flower clusters in white, pink, lavender, and red, attracting butterflies and hummingbirds. It is marginal in NE Florida zone 9b — summer heat and humidity promote powdery mildew and decline; select mildew-resistant cultivars and provide afternoon shade for best performance. Starting at $6.95.
Plant details
- Bloom Season
- Summer
- Flower Color
- White, Pink, Purple
- Growth Rate
- Moderate
- Foliage
- Semi-evergreen
- Soil
- Loam, Well-drained, Amended, Moist
Best planting months
Recommended forZone 9b · St. Augustine, FL
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F
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This monthGood windowOther months
Seasonal care
Good planting window.
Bloom season.
Ideal planting window.
May lose some foliage in cold snaps.
Care essentials
Light
Prefers full morning sun with afternoon shade in NE Florida's intense summer heat; too much direct sun promotes powdery mildew and wilting. Good air circulation is essential to reduce disease pressure.
Water
Requires consistent moisture — do not allow soil to dry out. Water at the base (avoid overhead irrigation) to minimize powdery mildew, which is a serious problem in Florida's humid summers. Mulch heavily to cool roots and conserve moisture.
Soil & Fertilizer
Plant in fertile, well-drained, moisture-retentive loamy soil amended with compost. Fertilize monthly during the growing season with a balanced fertilizer. Note: Phlox paniculata is marginal in zone 9b — choose heat- and mildew-resistant cultivars and expect replanting may be needed.
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Common questions
Is Garden Phlox a good plant for St. Augustine?
Garden Phlox is a perennial for Zone 9b coastal Florida gardens, with low salt tolerance, reaching 2-4 feet × 2-3 feet.
Care information verified from
Last reviewed February 2026. Our care guidance comes from trusted horticulture sources and decades of helping St. Augustine gardeners. Conditions here can vary dramatically from one area to the next, so come ask us and we'll tailor it to your yard.