Achillea abrotanoides (Vis.) Vis.
Ptarmica abrotanoides (basionym), Achillea atrata subsp. carvifolia, Achillea montenegrina, Ptarmica multifida subsp. abrotanoides
Bloom Time: June to August
Achillea abrotanoides is a herbaceous perennial flowering plant up to 16 inches (40 cm) tall. The stem is subglabrous to tomentose. The leaves are grey-green, hairy, pinnatifid or bipinnatifid and alternate, up to 1.2 inches (3 cm) long. This plant blooms from June to August, with many stellate, white flowers.
USDA hardiness zone 4a to 9b: from −30 °F (−34.4 °C) to 30 °F (−1.1 °C).
How to Grow and Care
It is most often propagated by division, so chances are you'll buy your Yarrow as a plant. Space your plants 12 to 24 inches (30 to 60 cm) apart if you're planting more than one plant.
You can also start your Yarrow from seed. Start seeds indoors about six to eight weeks before your last frost date. Sow the seeds in moist, normal potting soil. The seeds should just barely be covered by the potting soil. Place the pot with the seeds in a sunny and warm location.
The seeds should germinate in 14 to 21 days, depending on the conditions. You can speed up the germination by covering the top of the pot with plastic wrap to keep in moisture and heat. Remove the plastic wrap once the seeds have sprouted.
Regardless of whether your plants are grown from seed or bought as full plants, you will want to plant them in full sun. They thrive in a wide variety of soils but do best in well drained soil. Yarrows will even grow in very poor dry soils with low fertility soil… – See more at: How to Grow and Care for Yarrow.
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