Wallflowers

Question

Now they are finished. Can I leave them in, though they look untidy, or can I cut them back? If I do this, will they return next year?

Answer 1

Deadhead the flowers after flowering. The foliage can be attractive after the flowers have bloomed.
Wallflower can be grown as a perennial in warmer climates.

Here is a link that will help.
https://www.gardeningknowhow.com/ornamental/flowers/wallflower/growing-wallflower-plants.htm