Cut the entire plant back by half its height in late summer when blooming decreases to spur a new flush of blooms. Cut back flowers after the last wave of blooms in late fall to early winter to avoid the plant setting seed. The blooms can be left to go to seed if you want new seedlings in the spring.

Should I cut back Wallflowers after flowering?

Dig them up and compost them after flowering. Plant perennial wallflowers between May and September. Cut back periodically to maintain a good shape and promote flowering. Take cuttings regularly to ward against losses.

What to do when Wallflowers have finished flowering?

After flowering, cut back perennial wallflowers to keep them compact. This, along with liquid feeds, will also help encourage further flushes of flowers well into autumn. Wallflowers may be susceptible to Clubroot disease.