Achillea x kellereri, WOOLY YARROW, is a drought tolerant silver-grey evergreen perennial that grows to 3/4's of a foot tall and flowers in summer and fall. The blossoms are off-white. It can be grown in containers, or in the ground, in Zones 5-9.
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Achillea, also known as YARROW or MILFOIL, is a drought tolerant member of the Asteraceae family. There are 184 species of YARROW of which ten are perennials that range in height from one to three feet and grow in Zones 3-10. Over a dozen cultivated Achillea are in this database – all are drought tolerant perennials that range in height from 1 foot to 3 feet tall. Achillea ptarmica, grows to 5 feet tall.

Achillea attract a long list of specific butterflies and is a worthy addition to a wildlife friendly garden. Sightings support that Achillea millefolium attract the most diverse butterfly species but these sightings may be due to the popularity or availability of the plant, rather than proof that other cultivated YARROW species are less attractive to a broad range of butterflies.

According to the USDA “common yarrow is a weedy species and can become invasive. Proper care should be used to control the spread of the plant from its desired growing location.” Its invasive attribute may contribute to it being beneficial to wildlife. It is claimed the cultivars are less invasive. You may want to check how the parent plant behaves is in your region before purchasing any variant of A. millefolium.

Bird species attracted to the plant - to feed on insects and seeds - include flycatcher, jay, martin, oriole, phoebe swallow, sparrow, swift.