Plan on pruning off about one-third of the total height of the shrub in mid or late March. Pruning St. John’s wort involves reducing all branch tips and selectively removing some branches to thin the plant. You should remove any branches that are dead, damaged, or crossing.
How do you maintain hypericum?
It is not essential to prune Hypericum but if pruning is needed spring is the time to take the shears to it. A light prune in early spring if you want to restrict size or tidy up. Some Hypericum are prone to rust and pruning in the spring is one way to remove rust tainted branches.
Why is my St John’s wort plant dying?
A: Hypericum rust moved into our area a number of years ago. It causes brown spots on the leaves and makes the entire plant look like it’s dying. It probably won’t kill, or even seriously weaken your St. John’s wort (Hypericum calycinum) but it will make it so ugly you’ll wish it would.
Should you deadhead hypericum?
QUESTION: Do hypericum need dead heading? ANSWER: No, the flowers are produced all at once and dead heading will not encourage more to form.