How do you prune Hypericum Calycinum?
The best way to prune Hypericum shrub varieties, is by cutting all growth back to within a few inches of ground level. It will soon grow back to near its original size within one season.
Can you prune Hypericum in winter?
Established plants require no attention other than an annual prune to shape. This can be done with a hedge trimmer or a pair of secateurs. They are hardy down to -12°C so should survive well in winter for almost all areas of the UK.
Can I prune Hypericum in autumn?
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.
When should I cut back St John’s wort?
Prune plants as needed in early spring and they will produce a large crop of flowers in summer. Every three or four years, consider renewal pruning St. John’s wort. Renewal pruning involves shearing the plant back to half its height in spring.
When to trim Hypericum calycinum in the winter?
Evergreen in warm winter climates. Usually dies to the ground or suffers some tip dieback in cold winter climates, but blooms on new growth and comes back nicely each spring. In areas where it does not die in winter, shear or mow plants in late winter or early spring every 2-3 years to renew and induce new growth.
What’s the best way to prune a Hypericum?
Pruning hypericums as ground cover is just as heavy as it is for the shrubs. The plants need to be cut down to as near soil level as possible. This can be done by a lawn mower or by careful use of a strimmer.
How tall does a Hypericum calycinum tree grow?
May need to be kept in check with pruning to avoid it becoming invasive. Hypericum calycinum (Aaron’s beard) will reach a height of 0.6m and a spread of 0.6m after 5-10 years. Plant in well-drained, or moist but well-drained soil in sun or partial shade.
Are there any pests on Hypericum calycinum plants?
No pests worth mentioning, but Hypericum calycinum is prone to leaf rust – which is unsightly, but not normally lethal. Prevention with a fungicidal spray is best. Some of the shrubby types also suffer from rust to a lesser extent, and Hypericum x inodorum in particular can be spoiled.
