This doesn't mean you never use chemicals in your garden. Instead, you use them carefully, wisely and selectively. For instance, most lawns need some chemical weed control. You do not, however, need to spray the entire lawn with a weed killer if you just have weeds here and there. Spot spray problem areas to save money and chemical waste.
All plants resist pests and disease if they are healthy.
Buy quality plants and put them where they will grow best. Keep plants healthy with adequate water and fertilizer to nourish the soil so the plants can take up the nutrients they need. Bad bugs and disease prey on weakened plants. Before you purchase any pesticide or herbicide, know exactly what problem you face. Resist the urge to head for the nearest garden center or hardware store to pick up a chemical you guess will do the job.