Attract a host of garden helpers simply by growing a diversity of plants and offering these essentials. Carolyn Herriot also provides a handy list of "Plants to Lure Good Guys into Your Garden."

Does it make a difference in our gardens where things are planted? Do certain plants behave better when they're around certain other plants? The answer to both questions is yes.

Grow a tomato upside down? No, this is not about nestling a tumbler tomato into a hanging basket and letting it spill over the edges; it is literally planting and growing a tomato upside down and allowing it to defy gravity.