Category Archives: Horticulture Reports

Oregon Native Plant: Achillea millefolium (Common Yarrow)

Posted on by

Plant Name:  Achillea millefolium
Common name:  Common Yarrow
Plant Type:  Perennial
Plant Height:  3’
Spread: 2-3′
Bloom Time: April – September
Flower Color:  Yellowish White
Exposure: Sun to Part Shade
Soil Requirements:  Dry
Water Needs: Medium
Attributes:  Use in Fresh or Dried Arrangements with pleasing Fragrance; Value to native bees. Attracts butterflies.
Note:  A complex of both native and introduced plants and their hybrids.
Uses:  In fresh or dried arrangements; pleasant fragrance.
Native to:  North America
Oregon Native:  YES
USDA Hardiness Zone: 3 – 9

Report submitted by: Viki Ashford

Photo by: (c) Steve Guttman, some rights reserved (CC BY-NC-ND), http://www.flickr.com/photos/24013640@N02/3683708823

Horticulture Report:Phlox stolonifera (Creeping Phlox)

Posted on by

Plant Name: Phlox stolonifera
Common name: Creeping Phlox
Plant Type: Semi-Evergreen Perennial
Plant Height: 6″ – 12″
Spread: 9″ – 18″
Bloom Time: May – September
Flower Color: Lavender, Blue, or White
Exposure: Part Shade to Shade
Soil Requirements: Humus Rich, Moist Soil
Water Needs: Medium
Attributes: Deer Tolerant
Note: Slugs a problem in Moist Soil; Spread by Stolons
Uses: Ground Cover; Cover for Early Spring Bulbs; Border Fronts; Rock Gardens.
Native to: Southeastern US
Oregon Native: NO
USDA Hardiness Zone: 5 – 9

Report by Viki Ashford, AGC Member

Photo Credit: Michael Wolf / CC BY-SA (https://creativecommons.org/licenses/by-sa/3.0)

Horticulture Report: Agastache foeniculum

Posted on by

Plant Name:  Agastache foeniculum
Common name: Anise Hyssop
Plant Type: Herbaceous Perennial
Plant Height:  2’ – 4’
Spread:  1.5’ – 3’
Bloom Time: June – September
Flower Color:  Lavender to Purple
Exposure:  Full Sun to Part Shade
Soil Requirements: Well-Drained
Water Needs:  Dry to Medium
Attributes:  Deer Resistant; Drought Tolerant; Attracts Butterflies & Hummingbirds; Fragrant; Good Nectar Plant for Bees
Note:  Deadhead spent flowers to promote additional bloom.  Spreads by rhizomes & easily self-seeds.
Watch for Rust, Powdery Mildew, & Leaf Spot.
Uses: Herb; Naturalized Gardens; Good Cut or Dried Flower; Back of the Border Gardens.
Native to:  Northern North America
Oregon Native:  Native to Washington, but NOT Oregon
USDA Hardiness Zone:  4 -8

Report Submitted by: Viki Ashford

Horticulture Report: Threadleaf Coreopsis ‘Zagreb’

Posted on by

Plant Name:  Coreopsis verticullata ‘Zagreb’
Common name: Threadleaf Coreopsis ‘Zagreb’
Plant Type:  Herbaceous Perennial
Height:  18 – 24 inches
Spread:  12 – 18 inches
Bloom Time: May – June
Flower Color:  Bright Yellow
Exposure:  Full Sun
Soil Requirements: Tolerates Dry, Shallow, Rocky Soil;
Water Needs: Dry to Medium

Attributes: Showy Flower; Deer Tolerant; Drought Tolerant; No Serious Disease or Insect Problems; Attracts Butterflies

Note:  Deadheading encourages additional bloom & prevents unwanted self-seeding. Plants may be sheared in mid to late summer to promote fall re-bloom & remove sprawling foliage. Can spread aggressively by rhizomes & self-seeding. Crown Rot may occur in poor draining soils.

Uses: Native Plant Gardens; Cottage Gardens; Borders; Containers; Cut Flowers; Naturalizing, Butterfly Gardens, 
Native to:  Eastern USA
Oregon Native:  NO
USDA Hardiness Zone:  3 – 9

Report by: Viki Ashford

Globe Amaranth

Posted on by

In Hawaii, Gomphrena globosa is commonly used in long-lasting leis since it retains its shape and color after drying. In Nepal, these flowers are in  garlands used for the last day of Tihar, a five-day-long Hindu festival when sisters adorn brothers with a garland. This day is called Bhai Tika – Worship of Brother.

Plant Name:  Gomphrena globosa
Common name: Globe Amaranth
Plant Type:  Annual
Plant Height:  1’ – 2’
Spread:  .5’ – 1’
Bloom Time: June to Frost
Flower Color:  Pink, Purple, White, Yellow, Magenta.
Exposure:  Full Sun
Soil Requirements: Tolerates most soils.
Water Needs:  Medium
Attributes: Showy Flower; Good Dried or Long-Lasting Cut Flower; Attracts Butterflies; Drought Tolerant; Tolerates Clay Soil.
Note:  If sowing seeds, germination rate is low; pinch plants to promote bushiness.
Uses: Borders, Rock Gardens, Cutting Gardens, Containers.
Native to:  Central America & northern South America
Oregon Native:  NO
USDA Hardiness Zone:  2 – 11