How to Trim Herbaceous Perennials in Autumn
What are Herbaceous Perennials?
Herbaceous perennials are plants that die back to the ground in winter but come back to life in spring. They have soft stems and leaves that usually die back in autumn.
Why Cut Back Herbaceous Perennials in Autumn?
Cutting back herbaceous perennials in autumn has several benefits:
- It removes dead foliage and stems that can harbor pests and diseases.
- It helps to prevent fungal problems.
- It tidies up the garden and improves its appearance.
- It encourages new growth in spring.
Which Herbaceous Perennials to Cut Back
Not all herbaceous perennials need to be cut back in autumn. Some, such as ornamental grasses and plants with attractive seedheads, can be left standing over winter to provide food and shelter for wildlife.
However, most herbaceous perennials, including hardy geraniums, astrantias, and alchemilla, should be cut back to the ground in autumn.
How to Cut Back Herbaceous Perennials
To cut back herbaceous perennials, simply use sharp secateurs to remove all dead foliage and stems. Cut as close to the ground as possible, but be careful not to damage the crown (base) of the plant.
Perennials to Leave Standing Over Winter
Some herbaceous perennials, such as pulmonaria, evergreen perennials like epimediums and hellebores, and penstemons, should be left standing over winter. These plants provide winter interest and protect the crown from frost.
Feeding Herbaceous Perennials After Cutting Back
After cutting back your herbaceous perennials, apply a light mulch around them. This will help to protect the roots from frost and provide nutrients for new growth in spring.
