Tall Thistle
Cirsium altissimum
Last reviewed: August 2026
Tall Thistle (Cirsium altissimum) is a native forb found across eastern and central United States that blooms July through September. This hardy plant attracts bees, butterflies, and beetles with its purple flower heads.
Toxicity unknown
Tall Thistle (Cirsium altissimum) is not listed by the ASPCA Animal Poison Control Center (opens in new tab) or the other sources we check, so we have no verdict for it either way. Absence from those lists is not a clearance. If your pet shows symptoms after eating any plant, call the ASPCA at (888) 426-4435.
Light
full sun
Water
medium
Size
24"–72" H × 12"–36" W
Bloom
Jul, Aug, Sep
Native to
AL, AR, DE, FL and 26 more states
Pollinators
bees, butterflies, beetles
Before you buy
Your city may pay you to plant this
Cities and water utilities offer rebates for replacing lawn with native and water-wise plants. We track 445 programs across 44 states, each with a link to the provider and the date we last checked it.
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Tall thistle is a striking native biennial that produces large purple flower heads on sturdy stems from summer through early fall. This plant can reach up to 6 feet tall and provides excellent late-season color in prairie and naturalized settings.
Growing Tall Thistle
Grow Tall Thistle in full sun and medium water. Mature plants reach 24 to 72 inches tall and spread 12 to 36 inches wide. Expect low maintenance to keep it looking intentional in a front yard.
In an HOA neighborhood
Tall Thistle takes more care to keep looking intentional in a front yard. Maintenance level: low. Consider it for backyard or mid-zone beds rather than the street edge.
Works well in: backyard only.
- Thistle name creates negative perception
- Can look very weedy and wild
- May self-seed aggressively
Wildlife value
Host plant for painted lady butterfly.
The purple blooms are magnets for bees, butterflies, and beetles during late summer when many other flowers have faded. Seeds provide food for goldfinches and other birds in fall.
Common questions
- Where is Tall Thistle native to?
- Tall Thistle is native to 34 states across the eastern and central United States, from Massachusetts south to Florida and west to North Dakota, Kansas, and Texas.
- When does Tall Thistle bloom?
- Tall Thistle blooms from July through September, producing purple flower heads that attract various pollinators.
- What pollinators visit Tall Thistle?
- Tall Thistle attracts bees, butterflies, and beetles with its nectar-rich flowers during the late summer blooming period.
- What growing conditions does Tall Thistle prefer?
- Tall Thistle grows best in full sun but tolerates partial sun, and adapts to a wide range of moisture conditions from wet to dry soils.
- Is Tall Thistle HOA-friendly?
- Tall Thistle takes more care to look intentional in a front yard. Consider it for backyard or mid-zone beds rather than the street edge.
These answers were drafted with an AI model from this plant's data. Verify care details with a local expert.
Native range data from the World Checklist of Vascular Plants (Kew). Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.
Ready to grow Tall Thistle? Add it to your garden in Pollinator Patch to track it and get season-by-season care guidance.
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