Pruning and caring for acanthus If you let them be, your acanthus will go to seed and self-sow for the following spring. In fall, once the foliage has wilted away, cut back as short as you can in November, and protect the foot of the plant with dried leaf mulch for instance.

How do I manage Acanthus?

Grow bear’s breeches in moist but well-drained soil in full sun to partial shade. Cut back stems after flowering, and tidy foliage in spring. More on growing bear’s breeches: Acanthus mollis.

How do you prune bear's breeches?

In hot climates, the plants can be cut back after flowering. This will encourage fresh new foliage. Gardeners with cold winters should leave the plants standing and allow the leaves to protect the crown. Wait until you see new growth, in the spring, to cut back any damaged or declining leaves.