Southernwood was one of the first herbs I grew. I was drawn to its soft feathery leaves and crisp lemony fragrance. This artemisia does not get any flowers that I've noticed (perhaps they are just really tiny), and is a shrub form. For me, it tops out at about 3'. I have a difficult time with all artemisias (I think they prefer a more alkaline soil than I have), and this one is no different. I have a difficult time figuring out how/when to prune southernwood. Sometimes I will lose a whole side of the plant over the winter, resulting in a lopsided plant. My usual strategy is to cut it back pretty hard once it has broken dormancy in spring and hope for the best.
I grow this in the repellent section of my herb garden, and make up muslim bags filled with the dried herb to put in my clothing drawers to repel moths. When I think of it, I also just hang some in my closet fresh and let it dry there. Nice clean fragrance.
I've read that one can spread the foliage among carrots and cabbages to repel pests, but have not tried that.
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Per folklore, it protects against the plague, increases potency, and will put hair back on a bald head. I seriously doubt that, although having a bald husband, perhaps I'll give it a whirl. He will no doubt wonder why I'm rubbing his noggin with greenery, but he's seen worse...
CAUTION: Pregnant women should not use this herb due to its astringent nature.