Q: I have several 'Bowles Mauve' erysimum that are quite overgrown and need trimming. I know this is a short-lived perennial. My question is should I cut them back severely, to the woody stems? Will ...

THESE pretty perennials do not need replacing every year like their biennial counterparts, and nearly all are evergreen. They thrive in sun and on well-drained soil enriched with organic matter. Trim ...