That's the advice from Backyard Invasion, a new exhibit at the Carnegie Museum of Natural History in Pittsburgh, featuring images of invasive and endangered Pennsylvania plants.
Pittsburgh is a little out of my way this week, but here are some key points that are worth sharing no matter where you garden:
Because they create such high-maintenance headaches, it's a lot easier to just look the other way when invasive weeds start sprouting. But if they're left unchecked, entropy dictates we will become a planet of weeds. To learn more about the invasives threatening California, check out Encycloweedia, as useful as it is cleverly named. And make sure you, or your garden designer, really knows what's going into your garden—before that cute little "Tree of Heaven" becomes the noxious weed from hell.