Perennial
Rosinweed
Silphium integrifolium
Varieties We Carry
StandardSilphium integrifoliumStarrySilphium integrifolium
Sizes & Pricing
4 inFrom$9.95
1 galFrom$7.95
Fresh this week. Last restocked Jun 25.
LightFull Sun
WaterLow
Mature size3-6 feet × 3-5 feet
About Rosinweed
Rosinweed (Silphium integrifolium) is a robust prairie perennial of the central and eastern U.S., producing tall stems with rough opposite leaves and bright yellow daisy-like flowers from midsummer through early fall. It develops a deep drought-resistant taproot over time. Rated to zone 9b; it performs well in NE Florida's sandy, well-drained soils in full sun, attracting bees, butterflies, and seed-eating birds. Starting at $7.95.
Plant details
- Bloom Season
- Summer, Fall
- Flower Color
- Yellow
- Growth Rate
- Moderate
- Foliage
- Deciduous
- Soil
- Sandy, Loam, Well-drained
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.
Bloom season. Handles summer heat well once established.
Bloom season. Foliage may begin to change or drop. Ideal planting window.
Dormant — drops foliage.
Care essentials
Light
Rosinweed requires full sun for best growth and flowering. It is a prairie native that performs poorly in shade. In NE Florida, site in an open, sunny spot with good air circulation to manage Florida's summer humidity.
Water
Rosinweed is drought tolerant once its deep taproot is established, requiring little to no supplemental irrigation in NE Florida's sandy soils. Water during the first season to encourage establishment. It tolerates Florida's rainy season well as long as drainage is adequate.
Soil & Fertilizer
Thrives in lean, sandy to loamy, well-drained soils — typical of NE Florida. Avoid rich or heavily amended soils, which can cause excessive vegetative growth and flopping. No regular fertilization needed; a light spring application of slow-release fertilizer can be used on very poor soils.
Similar needs
Baby's Breath
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Beardtongue
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Black Eyed Susan
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Blanket Flower
Shares 5 of the same needs: full sun, low water, sandy, zone 9a hardiness, and pollinator-friendly.
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Butterfly Weed
Shares 5 of the same needs: full sun, low water, sandy, zone 9a hardiness, and pollinator-friendly.
From $4.95Same conditions
Calamint
Shares 5 of the same needs: full sun, low water, sandy, zone 9a hardiness, and pollinator-friendly.
From $6.95Same conditions
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Common questions
Is Rosinweed a good plant for St. Augustine?
Rosinweed is a perennial for Zone 9b coastal Florida gardens, reaching 3-6 feet × 3-5 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.