Threadleaf coreopsis (Coreopsis verticillata)

• Zones 1-24, 26, 28-45
• Full sun
• Moderate to little watering

Threadleaf coreopsis blooms abundantly all summer long, carrying its daisylike, 1- to 2-inch, yellow flowers above clumps of ferny, feathery foliage. Blossoms are borne so thickly that you can't deadhead individually, so just cut back the multistemmed branches with shears; they'll soon regrow to bloom again.

This plant isn't fussy about soil, but good drainage is important. It is somewhat drought tolerant. Divide clumps every 1 to 3 years ― in fall in warm-winter climates, in spring where winters are harsh.

C. v. 'Moonbeam' is a favorite; it forms a fluffy mound to 3 feet tall and wide, covered with pale yellow flowers.