Prunella vulgaris plant is commonly known as the self heal herb. It has been used medicinally for centuries. The entire plant is edible, and can be used both internally and externally to treat a number of health complaints and wounds. Depending on the region grown, prunella blooms from June through August with lavender or white flowers. This easy-care plant is adaptable enough to grow nearly anywhere, prunella performs best on woodland edges and meadows. They require cool to mild temperatures and sun to partial shade. Prunella is related to mint and prone to vigorous spreading, some form of containment (such as bottomless pots) may be necessary in flower beds or borders. Mature plants reach about 1 to 2 feet high (31-61 cm.), at which time they will fall over and attach new roots to the ground. Description from Gardening Know How
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