Cirsium Species, Bristly Thistle, Bull Thistle, Horrid Thistle, Spiny Thistle, Yellow Thistle

Cirsium horridulum

Family
Asteraceae (ass-ter-AY-see-ee)
Genus
Cirsium (SIR-see-um)
Species
horridulum (hor-id-YOO-lum)
Synonym
Sun Exposure
Full Sun
Foliage
Herbaceous
This plant is resistant to deer
Height
36-48 in. (90-120 cm)
Spacing
12-15 in. (30-38 cm)
Hardiness
USDA Zone 7a: to -17.7 °C (0 °F)
USDA Zone 7b: to -14.9 °C (5 °F)
USDA Zone 8a: to -12.2 °C (10 °F)
USDA Zone 8b: to -9.4 °C (15 °F)
USDA Zone 9a: to -6.6 °C (20 °F)
USDA Zone 9b: to -3.8 °C (25 °F)
USDA Zone 10a: to -1.1 °C (30 °F)
USDA Zone 10b: to 1.7 °C (35 °F)
Danger
Plant has spines or sharp edges; use extreme caution when handling
Bloom Color
Pale Pink
Rose/Mauve
Pale Yellow
Medium Purple
Cream/Tan
Bloom Time
Mid Summer
Late Summer/Early Fall
Mid Fall
Other Details
Category
Biennials
Perennials
Water Requirements
Drought-tolerant; suitable for xeriscaping
Average Water Needs; Water regularly; do not overwater
Foliage Color
Where to Grow
Bloom Characteristics
This plant is attractive to bees, butterflies and/or birds
Bloom Size
Other details
Soil pH requirements
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)
Patent Information
Non-patented
Propagation Methods
From seed; direct sow outdoors in fall
From seed; stratify if sowing indoors
From seed; sow indoors before last frost
Self-sows freely; deadhead if you do not want volunteer seedlings next season
Seed Collecting
Regional

This plant is said to grow outdoors in the following regions:

Saint Augustine, Florida

Sarasota, Florida

Trenton, Florida

Covington, Louisiana

Galliano, Louisiana

Medford, Oregon

Austin, Texas

Broaddus, Texas

Desoto, Texas

Red Oak, Texas

Santa Fe, Texas

Spring, Texas

Waxahachie, Texas

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Gardener's Notes:

3
positives
3
neutrals
1
negative
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C
Galliano, LA | April 2019 | positive

I've always enjoyed these large horrible weeds. They grow prolifically in pastures and along the sides of the highways. When I was yound ...Read More

T
Prairieville, LA (Zone 9a) | March 2012 | negative

This plant has grown well beyond the normal height/width...mine is 57 inches tall and has a span of just over 5 feet. Also, it is hardy t...Read More

C
Spring, TX (Zone 9a) | March 2011 | neutral

This spiny thistle is has been growing in my backyard here in Spring, Texas. It grows rapidly, daily there is new growth to admire.

C
Covington, LA (Zone 8b) | November 2010 | positive

From about late March the plant emerges with a broad crown of concentric prickly thorn tipped leaves. By May a thick stem 3/4" develops ...Read More

S
Broaddus, TX (Zone 8b) | July 2004 | positive

Purple Thistle grows as a perennial along roadsides and just about everywhere in early spring. I pot it up for bees, butterlies and/or b...Read More

S
Oklahoma City, OK (Zone 7a) | August 2002 | neutral

Yellow thistle is on the endangered species list in CT and NH.

F
Lutz, FL (Zone 9b) | April 2002 | neutral

This Thistle is a biennial with a tall branching stem, large variable colored flower heads and very spiny, clasping leaves. The flower he...Read More

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