St. Johns Wort 'Topas' - Hypericum perforatum salvia black and blue this plant does well in

this plant does well in moderately sunny spots where the soil remains moist during the summer

Once established

The cold hardiness is undetermined

Also called: Queen-of-the-Alps

St. Johns Wort 'Topas' - Hypericum perforatum salvia black and blue this plant does well inSt. John's Wort has been used medicinally for thousands of years, and makes a hardy perennial plant in most cooler locations. Attractive yellow flowers form in summer, which, along with some leaves, are what people harvest to make tea. This variety has been bred to have higher concentrations of active medicinal compounds. It can spread aggressively in some locations with underground runners or seeds, so make sure to keep this in mind if you plant it