Tag Archives: Plants for Rock Gardens

Horticulture Report: Allium acuminatum

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Plant Name: Allium acuminatum
Common Name:  Hooker’s onion
Plant type : Deciduous Perennial Herb
Height: 0’ – 2’
Spread: 0’ – 1’
Bloom Time: May – July
Flower Color: Purple, White, Pin
Exposure: Sun to Part Shade
Soil Requirements: Dry, well-drained; sandy/loamy
Water Needs: Occasional Summer Water
Attributes: Bulblets reproduce easily; strong onion smell; deer resistant; attracts pollinators: bats, butterflies, birds; nectar source for butterflies
Note: Flowers appear on long stalks after leaves have died; goes dormant in summer after going to seed
Uses: Rock Garden; Dry Open Meadows; Habitat Restoration; Green Roof
Native to:  Western United States
Oregon Native: YES
USDA Hardiness Zone 5 – 9

Firewise Plant: Lambs’ Ear

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Plant Name:  Stachys byzantina
Common name:  Lambs’ Ear
Plant Type:  Herbaceous Perennial
Plant Height: 12” – 15”
Plant Width:  15” – 18”
Bloom Time: July – Frost
Flower Color:  Purplish-pink spikes
Exposure: Full Sun
Soil Requirements: Dry, Well-Drained; Loam/Sand
Water Needs: Dry – Medium
Fire Resistant:  YES: Zone 2 – Plant 50’+ from Home.
Attributes: Attractive, Velvety, White-Silver Leaves; Tolerates Deer, Drought, Dry Soil; Foliage Provides Interesting Texture & Color; Attracts Butterflies
Uses: Ground Cover; Rock Garden; Accent in the border under shrubs.
Note: Spreads by creeping stems that root as they grow; Can be aggressive in rich soils; Damp leaves promote onset of disease; DON’T water overhead; Remove damaged leaves for neat appearance.
Native to: Turkey, Armenia, Iran
Oregon Native:  NO
USDA Hardiness Zone: 4 – 8

Report by: Viki Ashford

Photo credit :Jean-Pol GRANDMONT, CC BY-SA 3.0 https://creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons

Firewise Plant: Geranium cinereum

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Ballerina Cranesbill

Plant Name:  Geranium cinereum
Common name:  Cranesbill
Plant Type:  Semi-Evergreen Perennial
Plant Height:  4” – 6”
Plant Width:  10” – 12”
Bloom Time:  May – September
Flower Color:  Pink, White, Magenta
Exposure: Full to Part Sun
Soil Requirements: Chalk, Loam, Sand; Good Drainage.
Water Needs: Low to Average
Fire Resistant:  YES – Zone 1-8, Plant 30’+ from House.
Attributes: Deer Resistant; Attracts Butterflies.
Uses:  Ground Cover; Rock Gardens; Border Edging; Containers.
Note: Shear Plants by One-Half in Mid Summer to Encourage Bushy Growth & Repeat Blooming.
Native to: Pyrenees Mountains
Oregon Native:  NO
USDA Hardiness Zone:  4 – 9

Firewise Plants: Heartleaf Bergenia

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Plant Name:  Bergenia cordifolia

Common name:  Heartleaf Bergenia

Plant Type:  Herbaceous Perennial

Plant Height:  12” – 14”

Plant Width:  12” – 18”

Bloom Time: May – June

Flower Color:  Pink/White

Exposure: Part Shade to Full Shade.

Soil Requirements: Average, Medium, Well-Drained Soil.

Water Needs: Medium

Fire Resistant:  YES – Zone 8 – Plant 30’+ from house.

Attributes: Green Leaves in Summer Change to Burgundy in the Fall; Showy Flower; Good Cut Flower; Deer Resistant; Tolerates Heavy Shade.

Uses:  Groundcover; Rock Gardens; Shaded Front-of-the Border; Edger.

Note: Remove All Damaged Foliage in Late Winter/Early Spring; Remove Spent Flower Stems; Spreads Slowly by Rhizomes .

Native to: Russia

Oregon Native:  NO

USDA Hardiness Zone: 3 – 8

Horticulture Report: Rock Rose

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Plant Name:  Helianthemum nummularium

Common name:  Sun Rose or Rock Rose

Plant Type: Herbaceous Perennial

Plant Height:  8” – 10”

Plant Width:  12” – 16”

Bloom Time:  June – August

Flower Color:  Red, Pink, Yellow, Orange, Multicolored

Exposure: Full Sun

Soil Requirements: Dry, Alkaline, Rocky, Sandy Soil;

Water Needs: Dry; Low

Fire Resistant:  YES – Zone 1:    Plant 30+ feet from Structure

Attributes: Mounding Growth Habit; Drought Tolerant; Evergreen with Grey-Green Foliage; Attracts Bees/Butterflies.

Uses:  Rock Gardens; Edging Plant; Ground cover; Border Front.

Note: Shear Plants after flowering to encourage additional growth; each flower opens for only one day.

Native to: Europe; Asia Minor

Oregon Native:   NO

USDA Hardiness Zone: 4 – 7

Horticulture Report: Chives

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Plant Name:  Allium schoenoprasum

Common name:  Chives

Plant Type:  Perennial Bulb

Plant Height:  1’ – 1.5’

Plant Width:  1’ – 1.5’

Bloom Time: June – August

Flower Color: Pale Purple

Exposure: Full Sun to Part Shade.

Soil Requirements: Average, Medium, Well-Drained.

Water Needs:  Medium

Fire Resistant: YES – Zone 1 – Plant 10’+ from house.

Attributes:  Showy Flower with Fragrant Leaves; Deer/Drought Tolerant; Attracts Butterflies, Bees, Pollinators; Consistent performer

Uses: Herb; Herb/Vegetable Gardens; Rock Gardens; Containers.

Note:  Self seeds unless spent flowers are deadheaded; Harvest Leaves by clipping at base of plant; Root Rot may occur in poorly drained soil. 

Native to: Temperate Northern Hemisphere

Oregon Native:   YES

 USDA Hardiness Zone: 4 – 8

Chives

Report by: Viki Ashford, AGC Board Member

Photo by: Carlotta Lucas, AGC Board Member