Coreopsis verticillata 'Zagreb'
Threadleaf Coreopsis
Threadleaf Tickseed
Tickseed
Plant Family:
Asteraceae
Herbaceous Plant, Perennial
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
Foliage:
Green
Deciduous
Palmately 3-parted leaves with threadlike segments lend a fine textured and airy appearance to the plant
Oregon Native?
No
West State Native?
No
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:
18"
Growth Rate:
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:
Low
Mulch:
Organic
Long Term:
Divide every 2-3 years to maintain vigor
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:
May divide in spring every 2-3 years
Summer:
Deadhead flowers and stalk to the foliage, 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
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:
Also called: