General Culture:
Easily grown in average, dry to medium, well-drained soil in full sun. Will tolerate some shade.
Noteworthy Characteristics:
A profusion of button-like, pure white, 1/2" wide, double flowers resembling pompons in large branched heads on stems up to 2 feet. Unlike most other yarrows, this species features lance-shaped leaves which are neither deeply dissected nor fern-like in appearance. Excellent cut and dried flower. Tolerant of summer heat and humidity. Over time, a number of Achillea ptarmica clones or seed-raised plants with double flowers have been sold under the cultivar name of 'The Pearl' resulting in what should more accurately be referred to as a group, namely, The Pearl Group.
Problems: Click for detailed list of pests and problems.
No serious pest or disease problems. Does poorly in wet sites or in heavy, poorly drained soil. Although this cultivar is not as aggressive as the species, it is rhizomatous and tends to sprawl and appear weedy. To keep under control, divide plants every 2 to 3 years.
Uses:
An easy to mass perennial which will provide excellent contrast and long bloom to the border.
© Missouri Botanical
Garden, 2001-2010
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