Salvia uliginosa and bog sage are the two unattractive names of this pretty plant with lovely pale blue flowers. As both names indicate, it grows naturally in marshy ground, but in gardens it grows well in standard soil. In fact withholding of water can be a strategy to contain it. I waited a while to get uliginosa, as it is invasive and I wanted to have a spot where that wouldn’t matter. It spreads by underground stems that look and act a bit like couch grass. Unusually for salvias that grow…
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