Choosing your plants carefully when you design your garden can eliminate the need for any chemicals to keep it growing and thriving. By understanding specific qualities of all of your plants you can create a garden that can thrive under almost any conditions.
The folks over at Pools Spas Patios have put together a fantastic guide to aid anyone in any zone when picking out plants for a sustainable garden. For example they encourage selecting plants that draw pollinators:
An essential layer of an eco-friendly garden is the inclusion of plant material designed to provide food for pollinators (e.g. bees, wasps and other insects, as well as certain species of birds). Without these hard-working creatures, much of our local produce would disappear. Annuals bloom profusely, but perennials, flowering shrubs and trees tend to be better alternatives, as they require less watering and care and won't have to be replaced year after year. When planned properly, a garden can have a succession of blooms for the majority of spring through fall.
Check out all of their great tips at Pools Spas Patios.