Question: Should I mulch my perennial garden, and, if so, with what?

Answer: Absolutely. Nowhere will mulches be more beneficial. Organic mulches are ideal, since they not only perform all those normal mulch functions, but also because they break down to improve the soil later. Put 2 or 3 inches of compost or shredded pine bark mulch out at any time of the year. There are so many positives to mulching that you can make a case for it at any month.