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Spiny Bear’s Breeches

Acanthus spinosus

  • Thrives in USDA growing zones 5-9, requiring a protective winter mulch in northern climates.
  • Produces dramatic, architectural flower spikes reaching up to 4 feet tall in early summer.
  • Features bold, deeply cut, thistle-like leaves that remain shiny and attractive all season.
  • Slow-growing but long-lived specimen that tolerates clay soil and dry sites once established.
Regular price $4060
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Plant Size

Specifications

Plant specifications
Plant Characteristics Cold hardy, Flowering, Deer-resistant, Heat Tolerant, Drought resistant, Low Maintenance, Container Friendly, Attracts pollinators, Fragrant
Hardiness Zone 7a to 10b
Sunlight Full sun, Partial shade
Height 3-4 ft
Width 2-3 ft
Watering Needs Moderate
Preferred Soil Clay, Loamy, Peaty, Sandy
Growth Rate Slow
Growth Habit Compact, Spreading, Upright
Plant Life Cycle Perennial
Blooms In Spring, Summer
Flower Color Pink
Foliage Color Green
Suitable Space Outdoors
Botanical Name Acanthus spinosus
Species spinosus
Class Lamiales
Does Not Ship To AK, HI, ID, MT, PR

Frequently Asked Questions

What USDA hardiness zones is Spiny Bear’s Breeches suitable for?

  • Spiny Bear's Breeches thrives in USDA zones 6-10, showing excellent heat tolerance through summer months. This Mediterranean native prefers regions with mild winters and can handle brief cold snaps. Plant in heavier soils for best containment and longevity.

How big does Spiny Bear’s Breeches get at maturity?

  • Spiny Bear's Breeches forms a mounded base of 24-inch leaves with flower spikes reaching 3-4 feet tall. The plant spreads more aggressively in sandy soils but stays naturally contained in heavier clay. Plan for plenty of space in back borders, available at naturehills.com.

What are the soil requirements for planting Spiny Bear’s Breeches?

  • Spiny Bear's Breeches thrives in heavier soils where its natural spread is contained. It can become aggressive in loose, sandy conditions. Plant in well-draining soil with good structure to control growth while ensuring long-term establishment.

Does Spiny Bear’s Breeches tolerate partial shade or full sun?

  • Spiny Bear's Breeches thrives in full sun to partial shade conditions. The plant maintains its upright, lush foliage throughout summer heat, indicating good sun tolerance. For best flowering and sturdy 3-4 foot spikes, provide at least 6 hours of direct sunlight daily.

How much water does Spiny Bear’s Breeches need after planting?

  • Spiny Bear's Breeches needs regular watering the first year to establish its deep root system. Once established, this drought-tolerant perennial thrives with minimal supplemental water. Water deeply but infrequently to encourage strong roots - available at naturehills.com.

How long do the flowers on Spiny Bear’s Breeches last?

  • The flower spikes on Spiny Bear's Breeches typically last 4-6 weeks during their early summer bloom period. The sturdy 3-4 foot tall spikes hold their white and mauve-purple flowers well for cutting. Deadhead spent blooms to potentially encourage a second flush later in the season.

What are common pests or problems like root rot with Spiny Bear’s Breeches?

  • Spiny Bear's Breeches is remarkably pest-resistant, with its spiny foliage naturally deterring deer and most insects. Root rot can occur in poorly draining soils, which is why this plant performs best in heavier soils that provide natural drainage control. Plant in well-draining soil and avoid overwatering.

What is the shipping time for Spiny Bear’s Breeches in colder months?

  • Spiny Bear's Breeches ships as bare-root perennials during dormant winter months, typically taking 7-14 business days. Cold weather shipping protects the roots and ensures better establishment. Order early in winter for spring planting when soil can be worked.