Winter is usually the ideal slow time in the yard or garden to cut things back and tidy up. But pruning certain plants when it's cold can actually harm them.

You may be tempted to tidy up your garden this fall, but when it comes to this colorful perennial, it is best to hold off on the pruning. It's worth the wait.

Bill Pramuk is a registered consulting arborist. His column Trees & People runs in the Napa Valley Register on Saturdays. Catch up on his latest columns here.