A superb ground cover plant for sun or shade with large, black-purple foliage and prominent blue flowers in spring. Spreads readily but is easy to uproot and replant elsewhere. Copes well with heat so can be used in rockeries etc.
Ajuga reptans 'Black Scallop' P9 (0.5l) €4.95
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Photo by David J. Stang, CC BY-SA 4.0, via Wikimedia Commons