St John's Wort, Hypericum Hidcote. Young plant in 9cm pot, ready for immediate planting. This is a particularly hardy variety of St John's Wort, a plant used for many centuries for medicinal purposes. We do not recommend using medicinally without consulting a doctor. This plant grows on fast, in full sun and produces bright yellow flowers that can brighten up a border or feature individually in planters or large pots. It is a perennial and will come back year after year. These plants were pruned back during winter and are now starting to show vigorous new growth. Plant in full sun and water in well, feeding once a month. Prune back in late autumn for healthier new growth the following year. Free Postage.