Plant Min Zone: 6a
Plant Max Zone: 9a
Sunlight: Part Sun, Shade
Water / Rainfall: Average
Soil Quality: Average, Rich
Bloom Season: Early Summer, Summer
Flower Color: White, Lavender, Mauve, Multi-Colored
Berry / Fruit Color: None
Spring Foliage Color: Dark Green
Summer Foliage Color: Dark Green
Fall Foliage Color: Dark Green
Evergreen Foliage: No
Winter Interest: No
Scented Flowers: No
Drought Tolerance: Low, Medium
Wet-Feet Tolerance: Low
Humidity Tolerance: Low, Medium
Wind Tolerance: Low
Poor Soil Tolerance: No Extreme Soils
Height: 1.5' - 3'
Width: 2' - 3'
Growth Rate: Medium
Service Life: Long: 5-10 years
Maintenance Need: Medium
Spreading Potential: Low
Yearly Trimming Tips: Trim Perennial to Ground Around First Fall Freeze: No Winter Interest.
Plant Grouping Size: Specimen Planting of 1-3, Small Grouping of 3-5
Best Side of House: South Exposure, East Exposure
Extreme Planting Locations: Resistant to Rabbits
Ornamental Features: Multiple Seasons of Interest, Long Lasting Fall Color, Large Tropical Foliage / Flowers, Exceptional / Colorful Foliage
Special Landscape Uses: None
Possible Pest Problems: None
Plant Limitations: May get Occasional Winter-kill, Needs Thick Winter Mulch, Has Thorns, May be Poisonous
Spiny Bear's Breeches (Acanthus spinosus) is a clump-forming perennial that is grown as much for its attractive dark green foliage as for its architecturally bold flower spikes. The foliage of this species deeply cut and rather spiny looking dark-green leaves without actual spines. Flowers are creamy white (sometimes pinkish) and snapdragon-like and DO have sharp spines! It is the most thistly-looking of any of the various forms available. Foliage is mostly evergreen in warm winter climates, but plants lose their leaves when winter temperatures dip below 20°F. Foliage is usually persisting until mid-early December in Kansas. If low temperatures hit -10 degrees F, it may kill an un-mulched plant; protect any zone 6 perennial with thick layer of mulch. Established plants survived -16 degrees F and a week of single digit highs in February, 2021.