Nov 18, 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. Remove others from crowded areas. Hypericum St John’s Wort – Pruning, Winter Care and Fertilizing. Prune these shrubs in early spring before they leaf out. Remove 50% to 75% of the top of the shrub maintaining a mounded form. Remove the heaviest canes all the way to the ground. Aug 12, Prune your Saint John’s wort at the end of winter or at the beginning of spring, before the first buds start opening up, to ensure you’ll have optimal blooming.
Pruning every year isn’t necessary, but if you run the shears along the bush every 2 or 3 years, you’ll ensure your Saint John’s wort will keep a compact bearing. When pruning your St. John's wort, use a clean, sharp pruning shear and selectively remove some of the branches. Also, remove any dead or crossed branches. Do not Estimated Reading Time: 3 mins. Rejuvenate a St. John's wort over a three-year period in early spring.
The first year, remove one-third of the growth. Cut stems at a slight angle back to within 6 inches of the ground.