Category Archives: Horticulture Reports

Oregon Native: Collomia grandiflora

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Plant Name:  Collomia grandiflora
Common name: Large Flower Collomia
Plant Type:  Annual Herb
Plant Height:  4” – 3’
Bloom Time: April – June
Flower Color:  Yellow Salmon to White with Blue Pollen
Exposure:  Part Shade to Full Sun
Soil Requirements: Dry
Water Needs:  Low to No Water.
Attributes: Pollen for Bees.
Note:  Flowers are eaten by deer.  Powdery mildew is possible.
Uses: Cut Flower; Native Garden; Wildflower gardening; Pollinator Garden.
Native to:  Western North America
Oregon Native:  YES
USDA Hardiness Zone:  6a – 9b

Report by: Viki Ashford

Oregon Native Plant: Ceanothus cuneatus (Buckbush)

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High risk plant for wildfire, so not a good choice for homes in wildfire  regions!

Plant Name:  Ceanothus cuneatus
Common name:  Buckbrush
Plant Type:  Native, Perennial, Evergreen Shrub
Plant Height:  3.3’ – 11.5’
Spread:  2.5’ – 3.5’
Bloom Time: February – April
Flower Color:  Creamy White to Pale Blue to Lavendar
Exposure:  Full Sun
Soil Requirements: Tolerates Sand, Clay, & Serpentine, but needs fast drainage.
Water Needs:  Very Low Moisture.
Attributes:  Pollen/Nectar for Native Bees; Host for some Butterflies; Drought Tolerant; Deer Tolerant.
Note:  Mature Plants are highly flammable.
Uses:  Fragrant Flowers; Hedge/Screen or Small Tree.
Native to:  Western States to Baja CA
Oregon Native:  YES
USDA Hardiness Zone:  7b – 10b

Report by: Viki Ashford

Photo by: Eric in SF [CC BY-SA (https://creativecommons.org/licenses/by-sa/3.0)]

Oregon Native Plant: Chrysothamnus viscidiflorus (Yellow Rabbitbush)

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Plant Name:  Chrysothamnus viscidiflorus
Common name: Yellow Rabbitbrush
Plant Type:  Shrub
Plant Height:  8” – 39”
Bloom Time: August – October
Flower Color:  Yellow
Exposure:  Full Sun
Soil Requirements: Course to Medium; Well-Drained.
Water Needs:  Low
Habitat: Dessert and semi-dessert
Attributes:  Drought Tolerant; Provides Cover & Nesting Habitat for Small Birds; Fall Forage for Some Butterflies; Pollen/Nectar for Native Bees; Provides Cover for Rabbits.
Note:  Spring Forage for Deer.
Uses: Restoration & Re-vegetation Plantings; Drought-Tolerant Plantings; Native Gardens; Low Maintenance Gardens; Rock Gardens.
Native to:  Western North America
Oregon Native:  YES
USDA Hardiness Zone:  5b – 8b

Report by: Viki Ashford

Photo: Wikimedia Commons Taken By: Matt Lavin, Bozeman Montana, USA https://commons.wikimedia.org/wiki/File:Chrysothamnus_viscidiflorus_(3939348143).jpg

Horticulture Report: Dwarf Fothergilla

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Plant Name:  Fothergilla gardenii
Common name:  Dwarf Fothergilla
Plant Type:  Deciduous Shrub
Plant Height:  1.5’ – 3’
Spread: 2’ – 4’
Bloom Time: April – May
Flower Color:  White
Exposure:  Full Sun to Part Shade
Soil Requirements: Moist; Acidic; Organically Rich; Well-Drained
Water Needs: Medium
Attributes:  Showy; Fragrant Flower; Fall Color.
Note:  May spread by root suckers to form colonies if not removed promptly.
Uses: Compact specimen or accent; Shrub Border; Cottage Garden;
Native to:  Southeastern North America
Oregon Native:  NO
USDA Hardiness Zone:  5 – 8

Report by: Viki Ashford, AGC Member

Photo courtesy of:
Clemson College of  Agriculture, Forestry, and Life Services
Clemson, SC

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