Tag Archives: Evergreen Perennial

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

Oregon Native:  Solidago californica ( Goldenrod)

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Plant Name:  Solidago californica
Common name: Goldenrod
Plant Type:  Evergreen Perennial
Plant Height: 1.5’ – 2’
Plant Width:  .5’ – 1’
Bloom Time:  Summer -Fall
Flower Color:  Yellow
Exposure: Full Sun to Full Shade
Soil Requirements:  Medium Draining, Tolerates a variety of soils
Water Needs:  Wet in Winter/Spring, Dry in summer
Fire Resistance: Score 8, Plant 30 feet from structures
Attributes: Attracts Birds & Pollinating Insects.
Note:  May become Invasive due to Creeping Root stock; Deadhead or Leave Faded Flowers for Seed.
Uses: Bee/Butterfly Gardens, Native gardens, Pollinator Gardens
Native to:  Oregon & California
Oregon Native:  YES
USDA Hardiness Zone: 6 – 10

Report by: Viki Ashford and Carlotta Lucas

Photo by:  Stickpen, Public domain, via Wikimedia Commons

Horticulture Report: Penstemon strictus (Rocky Mountain Penstemon)

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Plant Name:  Penstemon strictus
Common name: Rocky Mountain Penstemon
Plant Type:  Evergreen Perennial
Plant Height: 1’ – 4’
Spread: 3’
Bloom Time: May – June
Flower Color:  Royal Blue to Purple
Exposure:  Full Sun to Part Shade
Soil Requirements: Dry, Light, Well-Drained Soil, but will tolerate Heavy Soil.
Water Needs: Low
Attributes: Supports Native Bees; Attracts Birds & Hummingbirds.
Note:  Spreads by Stolons.
Uses: Native Gardens
Native to: California, Wyoming, Arizona, New Mexico, Colorado, Utah.
Oregon Native:   NO
USDA Hardiness Zone:  4 – 9

Report by: Viki Ashford

Photo Credit: Jerry Friedman / CC BY-SA (http://creativecommons.org/licenses/by-sa/3.0/)