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Purple Thistle (Cirsium horridulum), Perennial

Varieties We Bring In

Nuttall'sCirsium horridulum
Sizes & Pricing
1 galFrom$9.95

Last received Jul 19, 2026.

We bring this in seasonally, so what is on the lot changes week to week. A received date shows when it last came in, not that it is here today.

Call (904) 471-0440 to confirm this plant and size before you make the trip.

LightFull Sun, Part Sun
WaterLow
Mature size2-5 feet (occasionally to 8 feet) × 1-2 feet

Pet toxicity: not on file, check before planting where pets chew

Pet safety guide

About Purple Thistle

Purple Thistle (Cirsium horridulum) is a native biennial wildflower of NE Florida's pinelands and open habitats, forming a rosette of spiny leaves before sending up stalks topped with large pink to purple flower heads. It is an outstanding pollinator plant, supporting bees, butterflies, and hummingbirds, and self-seeds freely in sandy soil.

Plant details

Bloom Season
Spring, Summer
Flower Color
Yellow, Purple
Growth Rate
Moderate
Foliage
Biennial
Soil
Sandy, Loam, Well-drained

Best planting months

Recommended forZone 9b · St. Augustine, FL

Recommended months: March, April, May, October, November.

January, other month
February, other month
March, good window
April, good window
May, good window
June, other month
July, other month
August, other month
September, other month
October, good window
November, good window, this month
December, other month
This monthGood windowOther months

Seasonal care

Bloom season. Good planting window.

Care essentials

Light

Plant in full sun to partial sun; performs best in open, sunny areas typical of NE Florida roadsides and pinelands.

Water

Drought tolerant once established; thrives on natural rainfall in NE Florida. Avoid sites with standing water. No supplemental irrigation needed after the first season.

Soil & Fertilizer

Grows in a wide range of well-drained sandy to loamy soils. No fertilization required; allow plants to self-seed as this biennial dies after flowering. Leave dead stems standing for native bee nesting.

Similar needs

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Common questions

Is Purple Thistle a good plant for St. Augustine?

Purple Thistle is a perennial. Mature size: 2-5 feet (occasionally to 8 feet) × 1-2 feet. Light: Full Sun, Part Sun. Water needs: Low. Purple Thistle is native to Florida. Recorded hardiness zone: 9a.

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.