They self-seed, grow anywhere and give a brilliant burst of yellow, says Monty Don. And now's the time to plant them. Annuals, like poppies or zinnias, grow, flower, set seed and die all in the same growing season.

What do you do with wallflowers once they have flowered?

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.

Do you cut back Wallflowers after flowering UK?

Wallflowers can be cut back after blooming, or you can wait until the end of winter or very early spring. Cut them to nearly the ground, and the plant will reward you with a new flush of growth when temperatures warm up.