Tag Archives: Plants for Rock Gardens

Oregon Native: Callirhoe involucrate (Purple Poppy Mallow)

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Plant Name:  Callirhoe involucrate
Common name:  Purple Poppy Mallow
Plant Type:  Herbaceous Perennial
Plant Height:  .5’ – 1’
Spread:  .5’ – 3’
Bloom Time: May – June
Flower Color:  Magenta
Exposure:  Full Sun
Soil Requirements: Dry, Shallow, Rocky
Attributes:  Showy Flower; Drought Tolerant; Nectar for Bees; Attracts Butterflies.
Note:  Grows well from seed & may self-show.  Long tap root makes transplanting difficult.
Uses:  Semi-Evergreen Ground Cover; Rock Gardens; Native Plant Gardens.
Native to:  Central United States
Oregon Native:  YES
USDA Hardiness Zone:  4 – 8

Report by: Viki Ashford

Photo by: Stan Shebs Wikimedia Commons https://commons.wikimedia.org/wiki/File:Callirhoe_involucrata_group.jpg

Oregon Native Plant:  Iris tenax (Oregon Iris)

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Plant Name:  Iris tenax
Common name:  Oregon Iris
Plant type:  Perennial
Height:  1’ – 3’
Spread: 2’
Bloom Time: April – June
Flower Color:  Pink, Purple, White, Yellow
Exposure: Part Shade
Soil Requirements:  Drier, Well-Drained
Water Needs:  Medium
Attributes:  Attracts Hummingbirds; Drought Tolerant once established; Evergreen.
Note:  Rhizomes may be poisonous to animals & humans.
Uses:  Rock Garden Plant; Edge of Gravel Path or Front in the Perennial Border.
Native to:  California, Oregon, Washington
Oregon Native: YES
USDA Hardiness Zone:  7 – 9

Report submitted by: Viki Ashford

Photo Resource: Wikimedia Photo by: Peter B James Pbjamesphoto

Oregon Native: Tufted Hairgrass

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Plant Name:  Deschampsia cespitosa
Common name:  Tufted Hairgrass
Plant Type:  Ornamental Grass
Plant Height:  2’ – 3’
Spread:  1’ – 2’
Bloom Time: July – September
Flower Color:  Tones of Gold, Silver, Purple, Green
Exposure:  Part Shade
Soil Requirements: Average, Medium, Moist, Well-Drained Soil;
Water Needs: Medium
Attributes:  Showy Flowers; Attracts Birds; Winter Interest; Airy Panicles of Variably-Color form a cloud that is attractive when backlit; Deer Resistant.
Note:  Cut Foliage to Ground in Late Winter
Uses: Ground Cover; Rock Gardens; Mixes well with Shade Loving Perennials; Butterfly Gardens, Woodland Gardens.
Native to:  Most of North America
Oregon Native:   YES
USDA Hardiness Zone:  4 – 9

Report by: Viki Ashford

Horticulture Report: Alpine Geranium

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Plant Name:  Erodium reichardii
Common name:  Alpine Geranium
Plant type: Perennial Herb
Height:  6”
Spread:  12”-14”
Bloom Time:  Spring to early summer
Flower Color:  Pale Pink with Deep Pink Veining
Exposure: Full Sun to Part Shade
Soil Requirements:  Gritty, well-drained Soil
Water Needs: Drought Tolerant
Attributes:   Attracts Bee; Deer Resistant; Long Blooming
Note:   Propagate by Seedlings or Divisions
Uses:  Ground cover; Rock Gardens; Pollinator Gardens, Perennial Gardens, Cottage Gardens
Native to: Mediterranean
Oregon Native:  NO
USDA Hardiness Zone:  7 – 10

Submitted by: Viki Ashford, Ashland Garden Club

Photo by: C T Johansson [CC BY-SA 3.0 (https://creativecommons.org/licenses/by-sa/3.0)]  Wikimedia Commons

Filling in the Spaces

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The small spaces between rocks, and stone pathways are tough area to grow anything except weeds, but here are a few plants that thrive between the cracks and crevices.

Thymus serpyllumCreeping Thyme  (Thymus serpyllum):  Excellent for pathways,  grows flat and tolerates foot traffic.  Likes well-drained soil.  Soft fuzzy Appearance. Herbaceous Perennial, Fragrant, Pink flower, Sun/Part Shade, Deer Proof, Attracts Bees. USDA Hardiness Zones  4 to 9.

 

Wooly thymeWooly Thyme (Thymus pseudolanuginosus): Durable plant perfect for filling in between stepping stones, or rock gardens. Soft foliage creates a low, lush mat with pink flowers.  Herbaceous Perennial, Attracts Butterflies & Bees,  Sun/Part Shade,  Drought Tolerant/ Water Wise Groundcover, Deer Proof.  USDA Hardiness Zones  5 to 8.

Blue Star Creeper.jpgBlue Star Creeper (Isotoma fluviatilis):  A wonderful creeping perennial for filling in. Use between stepping stones, under shrubs, in rockery, around ponds.  Tiny green leaves form a dense, low mat ½ inches high.  Produces tiny light blue star-shaped flowers which cover the plant late spring into fall.  Perennial, Evergreen, Full Sun/Part Shade,  Tolerates Foot Traffic, Like Moisture, Deer Proof.  USDA Hardiness Zones 5 to 9.

Horticulture Report: Sweet Woodruff

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Plant Name: Galium odoratumsweet-woodruff
Common Name:  Sweet Woodruff
Plant type: Herbaceous perennial
Height: 8 to 12 inches
Spread: 2-3 feet  
Bloom Time: May – June
Flower Color: White
Exposure: Full to Part shade
Soil Requirements: Rich well-drained soil
Water Needs: Regular – moist
Attributes: Dainty Fragrant Flowers, Fragrant Vanilla-like Leaves & Stems
Note: Tolerant of Back Walnut trees
Uses: Shade Garden, Pathway & Garden Edging, Woodland Garden, Rock Gardens, Herb Garden, Naturalize, Groundcover
Native to: Northern Asia, Northern Africa &  Europe
USDA Hardiness Zone: 5-9