Perennial
Thoroughwort
Eupatorium rotundifolium
Varieties We Carry
RoundleafEupatorium rotundifoliumStandardEupatorium rotundifolium
Sizes & Pricing
1 galFrom$9.95
Fresh this week. Last restocked Apr 14.
LightFull Sun, Part Sun
WaterModerate
Mature size3-4 feet × 2-4 feet
About Thoroughwort
Roundleaf Thoroughwort (Eupatorium rotundifolium) is a Florida native perennial wildflower that produces flat-topped clusters of small white flowers in fall, highly attractive to butterflies and native bees. It dies back in winter and re-emerges from the roots in spring, thriving in sunny, open habitats from pine flatwoods to upland meadows throughout NE Florida. Starting at $9.95.
Plant details
- Bloom Season
- Fall
- Flower Color
- White
- Growth Rate
- Moderate
- Foliage
- Deciduous
- Soil
- Sandy, Loam, Well-drained, Wet
Best planting months
Recommended forZone 9b · St. Augustine, FL
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This monthGood windowOther months
Seasonal care
New foliage emerges. Good planting window.
Active growing season.
Bloom season. Foliage may begin to change or drop. Ideal planting window.
Dormant — drops foliage.
Care essentials
Light
Plant in full sun to part sun; Roundleaf Thoroughwort blooms most prolifically in open, sunny positions and is commonly found in open pine flatwoods throughout NE Florida.
Water
Tolerates moist to somewhat dry conditions; no supplemental irrigation typically needed once established in Florida's sandy flatwood soils — supplemental watering during extreme drought will help sustain blooms.
Soil & Fertilizer
Thrives in lean, sandy to loamy Florida soils without fertilization; avoid rich soils or excess nutrients, which can cause rank growth and flopping — no amendments necessary.
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Common questions
Is Thoroughwort a good plant for St. Augustine?
Thoroughwort is a perennial for Zone 9b coastal Florida gardens, reaching 3-4 feet × 2-4 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.