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Bear's Breeches
August Plant of the Month 2021

A classical Plant from Ancient Greece

bear's breeches,acanthus mollis,acanthus spinosus,Corinthian column order,herbaceous perennial,summer flowers,sun perennials sun
Bear's breeches flowers are striking.
bear's breeches,acanthus mollis,acanthus spinosus,Corinthian column order,herbaceous perennial,summer flowers,sun perennials
Flowers are compared to snapdragons. They are lipped and grow vertically along leafless stems.
Picture
Acanthus spinosus have spikier foliage compared to the mollis species.
Picture
The fascinating flowers of an Acanthus spinosus.
Picture
Leaves from this Acanthus mollis are deeply lobed and grow up to 3 feet long.
Picture
Give bear's breeches lots of space so they can be admired for the form, flowers and foliage.
Common Name:  bear’s breeches
Botanical Name:  Acanthus mollis
Form:    clump-forming rosette
Family:  Acanthaceae
Genus:  Acanthus
Species:  mollis
Plant Type: herbaceous perennial with tuberous roots
Mature Size:  3 to 5 feet x 2 to 3 feet
Origin:  Mediterranean
Hardiness Zone: 7 to 10
Foliage:  emerge from a rosette, dark green, glossy, deeply lobed, up to 36” long and 12” wide
Flowers: maroon-purplish and white 2-lipped, hooded flowers up to 2” long are surrounded by spiny bracts, borne in vertical rows on erect leafless stems up to 5ft tall in summer
Fruit: one or two brown seeds in a pointed capsule
Exposure:  sun to partial shade, avoid hot summer afternoon sun
Soil:  soil tolerant, dislikes wet soil
Uses:  accent, foundation plant, specimen, formal gardens, woodland edges
Propagation:   root division, seeds
Pruning:  remove flower stalks after flowering
​Problems:  invasive where conditions are favorable

Comments: 
Carl Linneus, the noted botanist and ‘Father of Taxonomy’, first described this historical plant in his book Species Plantarum in 1753. The large, deep green, attractively ornate foliage were the inspiration for Greco-Roman and Classical architecture. This ‘Corinthian’ design was carved into columns, and has been used throughout the ages denoting a classical elegance that is still revered today.
 
Bear’s breeches, Acanthus mollis, makes a bold but elegant and classical statement that never goes unnoticed. Even without its towering snapdragon-like flower spikes, their large 3 foot leaves are very attractive and stand out even when mixed with other greenery. In warm climates, the foliage will stay evergreen, but will go dormant when temperatures dip to below freezing.
 
Although they are soil tolerant, soggy soils promote rot. Lack of flowers are caused by too much shade or from late spring frosts. To protect the crowns and potential blooms, don’t remove their foliage in fall, instead cut them off in spring as new growth emerges.
 
Keep plants away from hot afternoon sun as this may cause wilting. They will also go dormant in summer if they are not watered.
 
Bear’s breeches spread via underground tubers and seeds. This is why it is important to remove the spent flower spikes before they go to seed. Tubers will spread in warm climates and when grown in loose soils. In areas where they are too aggressive, install an 8 inch barrier to confine their roots. This plant is invasive in parts of California, Australia and New Zealand.
 
Other Cultivars and Species:
Acanthus mollis ‘Latifolius’ are hardier, but doesn’t flower as freely as the species and have larger foliage. Zones 7 to 10, 2-2.5′ x 2-3′.
Acanthus spinosus is an alternate species know for leaves with spines along the edges (margins). Zones 5 to 9, 3’ - 4’ x 2’ - 3’.
Acanthus balacanicus, Balcanicus Bear's Breeches, flowers profusely, with white or pale pink flowers, with deep lobes spaced far apart. Zones 7 to 10, 2’ - 4’ x 2’-4’.
Picture
A Corinthian column at the Getty Villa in Los Angeles, denotes the ornateness of the Acanthus.
Picture
In some areas, where conditions are suitable, Acanthus may spread underground.

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  • Home
  • About, Services, Contact
  • Ask Amanda
  • Roses
    • Types of Roses
    • Easy Roses
    • Climbing Roses
    • Portland's Rose Test Garden
    • Rose Insects & Diseases
    • Pruning Roses
    • Rose Sawfly
    • Rose Bloom Balling
  • Pruning Basics 101
    • Pruning Tools
    • Winter Pruning
    • Pruning Grapes
    • Pruning Clematis
    • Prune Your Own Garden Registration
  • Lawn Basics
    • Lawn Reno, Seed & Sod
    • Lawn Maintenance Schedule
    • Spring Lawn Care
    • Moss in Lawns
    • Lawn Alternatives
    • Lawn Grub Control
  • Mulch & Mulching
    • Living Mulches - Groundcovers
  • Propagation
    • Growing Seeds Outdoors
    • Growing Seeds Indoors
    • Taking Cuttings
    • Seed & Plant Catalogues
  • How to Garden Topics
    • Fall Garden Chores
    • Planting Know-How
    • Soil Building
    • Watering Tips & Techniques
    • Drought Gardening
    • Sheet Mulching, Lasagna Gardening
    • Cover Crops
    • Composting
    • Compost Tea
    • Houseplant Winter Care
    • Hummingbirds in Winter
    • Winterize Your Garden
    • Ponds in Winter
  • Growing Food
    • Spring Veggie Gardening
    • Crop Rotation, Succession & Companion Planting
    • Harvesting
    • Growing Potatoes
    • Winter Veggie Gardening
    • Taming Tomatoes
    • Speeding up Tomato Harvest
    • Tomato Tips
    • Saving Tomato Seeds
    • Tomato Troubles
  • Plant Pests 1
    • Plant Pests Part 2 - Controlling Insects
    • Garden Inspections
    • Helping Pollinators
    • Dogwood Anthracnose
    • Viburnum Leaf Beetle
    • Dormant Oil/Lime Sulfur
    • Japanese Beetles
    • Peony Blotch/Measles
    • Slugs & Snails
    • Horsetail, the Weed
    • June Beetle
    • Powdery Mildew
    • Soil Solarization
    • Rhododendron Leaf Spot
    • Plant Rusts
    • Black Knot
  • Container Growing
    • Choosing a Container
  • Feeding Plants 101
    • Fertilizers & Ratios
    • Nutritional Deficiencies & Toxicities
    • Organic Plant Food
  • Plant of the Month
    • Spring Flowering Bulbs
    • Colourful Fall Plants
    • Abelia
    • American Sweetgum
    • Ash (Fraxinus) Trees
    • Astilbes
    • Aubretia, Rock Cress
    • Aucuba, Japanese Spotted Laurel
    • Autumn Crocus
    • Bear's Breeches
    • Beautyberry, Callicarpa
    • Black-eyed Susans
    • Bleeding Heart, Lamprocapnos spectabilis
    • Calla Lilies
    • Dahlias
    • Daylily
    • Delphiniums
    • Devil's Walking Stick, Aralia spinosa
    • Dwarf Alberta Spruce
    • Dwarf Burning Bush
    • Fall Asters
    • Flowering Currants
    • Flowering Quince
    • Fritillaria
    • Garden Peonies
    • Garden Phlox
    • Ginkgo biloba
    • Grape-hyacinths
    • Handkerchief or Dove Tree
    • Harry Lauder's Walking Stick
    • Heathers
    • Hellebores, Lenten roses
    • Himalayan Sweet Box
    • Jack-in-the-pulpit, Cobra Lily
    • Japanese Anemones
    • Japanese Forest Grass
    • Japanese Maples
    • Japanese Skimmia
    • Japanese Spurge
    • Laurustinus viburnum
    • Lavenders
    • Lily-of-the-Valley Shrub, Pieris japonica
    • Mediterranean Spurge
    • Mexican Mock Orange
    • Montana Clematis
    • Mountain Ash
    • Oriental Poppies
    • Oriental Lilies
    • Paperbark Maple
    • Pink Dawn Bodnant Viburnum
    • Poinsettias
    • Oregon Grape Holly
    • Ornamental Kale
    • Peruvian Lily, Alstroemeria
    • Phalaenopsis, Moth Orchids
    • Persian Silk Tree
    • Portuguese Laurel
    • Rose of Sharon
    • Sneezeweed, Helenium
    • Snowberry
    • Snowdrops
    • Star Magnolia
    • Strawberry Tree, Pacific Madrone
    • Stewartia
    • Torch Lily, Kniphofia uvaria
    • Tree Peonies
    • Tuberous Begonias
    • Virginia Creeper
    • Weigela
    • Winterhazel, Corylopsis
    • Winter Camellia, C. sasanqua
    • Wintergreen, Gaultheria procumbens
    • Witch Hazel
    • Wood Anemones
    • Yews
  • Garden Tour Blogs
  • Monthly Flower Arrangements
  • Website Index
  • Subscribe
  • Need Help?