Answer: In your foggy climate, yarrow (Achillea) will need full sun to do its best. You can divide it now or in the fall. Simply dig the plant out of the ground with as much of the root mass intact as possible. Lay the clump on its side and cut it into smaller clumps by slicing through the entire plant, making sure there are both roots and foliage attached to each section. Replant each division, water well, and stand back! After some initial shock (which might include wilting), the divisions should establish themselves and put out new growth. Deeply soak your new plants once each week and they should perk up and perform well for you this summer.
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