Is there anything ground covers can't do? They are useful in problem areas like steep slopes, under trees and shrubs, and in spaces that need erosion control. They also reduce maintenance by enveloping areas that would ordinarily need a boatload of mulch to keep weeds at bay. Now, not all ground covers play nice. Some species will not only cover bare ground, but they will choke out neighboring plants. But that's not the plants we're talking about today. We're focusing on ground covers that will spread out thickly, but politely, and smother out any potential weeds in the process. We discuss options for sun, shade, and even drought tolerant selections for those truly hellish spots. And in case you think we're too East Coast centric, today's expert calls in from California to offer up some plants that thrive in the Western half of the country.

Expert testimony: Fionuala Campion is the owner and manager of Cottage Gardens of Petaluma in Petaluma, California.