Curious about forest gardens? A simple forest garden contains three layers: trees, shrubs, and ground plants. For the adventurous gardener, a deluxe forest garden can contain as many as seven tiers of vegetation. A bountiful forest garden can produce plenty of food — you just need to take a page from mother nature’s book. It’s time to look at forest garden design. A simple forest garden contains three layers: trees, shrubs, and ground plants. But for those who like to take advantage of every planting opportunity, a deluxe forest garden can contain as many as seven tiers of vegetation. As the illustration below shows, a seven-layered forest garden contains tall trees, low trees, shrubs, herbs, ground covers, vines, and root crops. More info http://www.chelseagreen.com/content/designing-a-forest-garden-the-seven-story-garden/