Coreopsis verticillata, also known as Threadleaf Coreopsis, form fern-like foliage in a clump and blooms from early summer to late fall. Full of cream-yellow daisiess a spreading clump of very delicate, ferny foliage. This outstanding selection bears loads of starry creamy-yellow daisies, from early summer into late fall. Clipping off faded flowers will encourage buds to form all season. Tolerant of hot, dry sites, once established. Excellent for cutting. Great for edging in the sunny border, or planting in mixed containers. Coreopsis verticillata tolerates heat and humidity. Easily divided in early spring. A former Perennial Plant of the Year, this has performed consistently well in gardens all over the continent.
Winchester Gardens generally stocks this item.
Plant in spring, spacing plants 2 to 3 feet apart, depending on the variety. Prepare the garden bed by using a garden fork or tiller to loosen the soil to a depth of 12 to 15 inches, then mix in a 2- to 4-inch layer of compost. Dig a hole twice the diameter of the pot the plant is in. Carefully remove the plant from its container and place it in the hole so the top of the rootball is level with the soil surface. Carefully fill in around the rootball and firm the soil gently. Water thoroughly.
Apply a thin layer of compost each spring, followed by a 2-inch layer of mulch to retain moisture and control weeds. Water plants during the summer if rainfall is less than 1 inch per week. Stake tall varieties to keep them upright. After the first killing frost, cut stems back to an inch or two above soil line. Divide plants every few years as new growth begins in the spring, lifting plants and dividing them into clumps.
Salvia – The purplish-blue blooms of perennial salvia create a wonderful companion to golden coreopsis.
Veronica – The upright spires of spike speedwell stand in stark contrast to the lax and billowy form of coreopsis. Blue-flowered varieties look especially good with coreopsis.
Yarrow – To make the sunny perennial border sing with color, pair the golden hues of ‘Coronation Gold’ yarrow with bright yellow or gold-and-red bicolor coreopsis.