Coreopsis verticillata 'Zagreb'
Common Name(s):
Threadleaf Coreopsis
Threadleaf Tickseed
Synonym:
Gyrophyllum verticillatum
Tickseed
Flower:
Yellow
Blooms :
May
to:
Jul
Yellow, daisy like flowers 1-2" in diameter with yellow untoothed rays and yellow center discs
Botanical Description
Fragrant?
NO
Family:
Asteraceae
Herbaceous Plant, Perennial
Foliage:
Green
Palmately 3-parted leaves with threadlike segments lend a fine textured and airy appearance to the plant
Fall Color?
NO
Deciduous
Photo by:
Heading 6
Oregon Native?
NO
West State Native?
NO
Origins:
Eastern North America
Site Selection
Minimum USDA Hardiness Zone:
3
Water Needs:
M
Sun Needs:
Full Sun
Deer Resistant?
YES
Firewise?
YES
Height:
12-18"
Spread:
1.5-1.5'
Growth Rate:
Medium
Native Habitat:
Coreopsis is a genus of between 75-80 species from North America, Mexico, Central and South America in rocky and sandy soils
Soil:
Well-drained soil, thrives in poor, sandy or rocky soils with good drainage
Care Recommendations
Maintenance Level:
Low
Fertilizer:
Can apply compost in early spring keep nitrogen levels low
Mulch:
Shredded bark, compost, or gravel
Occaional deep watering in dry spells, feed lightly with compost, shear plant back to 1/2 in mid-summer, leave foliage over winter, divide every 2-3 years to maintain vigor
Long Term:
Winter:
Clean debris away from the base of the plant and provide a layer of compost but not over the crown to protect over winter
Spring:
Cut back plant to 1-2" above soil, may divide in spring every 2-3 years, apply compost
Summer:
Deadhead flowers, shear back 25-50% in late summer to encourage rebloom in fall.
Fall:
It's not necessary to cut back in fall - but leaving 6-8" of stem helps protect the plant in winter
General Care Comments:
Requires 6 hours of direct sun, good drainage, supplemental watering in dry spells, compost in spring, leave dead stems standing over winter, shear plant by 1/2 mid-summer, divide every 2-3 years
Common Problems
Tends to sprawl and can self-seed and spread by rhizomes in moist, fertile soil. Crown rot may occur if grown in moist poorly drained soils.
Diseases:
Uncommon diseases - powdery mildew, botrytis, fungal spots
Insects:
Aphids, spider mites, various beetles
Environmental Problems:
Crown rot if not in well drained soil
Pests:
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