If you have a yard—and there is anything at all growing in that yard—you really do need to know your county's cooperative extension agent. Seriously. You do. There is an office in each county throughout the country, where you'll be pleasantly surprised by just how much information and assistance is available just for the asking.
Part of the US Department of Agriculture, the network of cooperative extension offices is one of the most accessible (and mostly free) benefits available to the landscape owner. So I decided to ask my own agent, Tracey Payton Miller, a few questions, just to give you an idea.