Hypericum shrubs may be referred to as St. John's wort, and some are known as tutsan. This vigorous UK native plant forms plant colonies topped with countless, five-petalled yellow flowers. At your local nursery you will most likely find a broad leaved variety of Hypericum labeled St. John's Wort. Due to noxious weed laws, seed of Hypericum perforatum not available to the states of California, Colorado, Montana, South Dakota or Washington. Buy Hypericum Calycinum – Rose of Sharon for only £ 3.99 excluding shipping costs (orders over GBP99,99 will be deliverd without shipping costs) throughout the whole United Kingdom! The Beauty That Is Hypericum Perforatum What is Hypericum perforatum? More Info Feed and water regularly throughout the growing season while young Hypericums plants become established. St. John’s Wort (Hypericum Perforatum) is a plant cultivated in Europe, North and South America, Australia, New Zealand, and Eastern Asia, with yellow, star-shaped flowers and five petals. Hypericum perforatum, known as perforate St John's-wort, common Saint John's wort and St John's wort, is a flowering plant in the family Hypericaceae.St. Ordered today = delivered tomorrow! St. Johns Wort (a native of Europe) occurs commonly along roadsides and hedgerows, and this herb has one of the most glamorous histories in the plant kingdom.