If the cooler weather and turning leaves haven’t alerted you, the calendar can’t lie. Tomorrow is the first day of autumn. Can our first frost be far behind? It’s tempting to let the change of seasons put a stop to gardening for the year, but there’s still much to do. (See my previous post on “Putting Your Garden to Bed” for ideas.) Of course we know that many spring-blooming bulbs go in the ground now. But how about perennials, shrubs, and even trees? Can we plant (or transplant) them now? Even for those of us who live in places with cold winters, fall is a terrific time to plant.