What do plant-lovers do when it gets too cold to grow anything outside? Why, they plan for next year's landscape design, of course! As you research and develop a planting plan for next year, you'll no doubt see descriptions for plants that mention their sunlight requirements: "full sun," "partial sun / partial shade," "dappled shade," "full shade." But what do these sunlight requirements really mean? Marie Iannotti, About's Gardening Guide, explains the shades of difference between sunlight requirements.