Common name: Zagreb tickseed
Origin: Threadleaf tickseed is native to the southeastern United States, but the cultivar Zagreb is a garden hybrid
Where it will grow: Hardy to -40 degrees Fahrenheit (USDA zones 3 to 9; find your zone)
Water requirement: Average to low
Light requirement: Full sun
Mature size: 2 feet tall and wide but will spread slowly to form larger clumps
Benefits and tolerances: Attracts butterflies and bees; deer and rabbit resistant (mostly); low maintenance; drought tolerant; tolerates poor soil
Seasonal interest: Midsummer to fall
When to plant: Spring or fall
When planted as a mass, this tickseed becomes a sunny yellow haze with soft, feathery foliage that moves gently in the breeze. The flowers themselves last from midsummer to fall without deadheading, although I suspect the blooms would be even more prolific were I to take the time to deadhead.
Deadheading is not necessary and would be too time consuming. Some gardeners like to shear back the plant in midsummer to encourage more flowers, but I have never done so, since it blooms until early fall anyway.
By late summer the billowing foliage may begin to flop over a little, especially if you have rich soil. This is usually a problem only if the plants have been used to line a pathway. If this happens simply insert a series of twigs or sticks in a crisscross pattern to discreetly hold them back. The clumps will spread and can be divided and transplanted to other areas in early spring or late fall.
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