A good garden plan ensures you get the best possible results. Creating a unified yard or garden that accents your home and provides years of enjoyment requires some thinking before getting to work. And figuring out what you already have helps determine what you need. Start by drawing a map of your yard with existing trees, shrubs, slopes, patios and whatever else is out there. The map can be as formal or casual as your need for detail dictates, but the more accurate it is, the more thorough your garden plan will be.