If you don't know what you're doing in the garden, you can cause more damage than all of these pests put together. Mastergardening.com suggests you avoid destroying your garden by selecting plants appropriate to your climate and designed not to attract local pests. Regular and appropriate watering keeps plants healthy, which can go a long way towards helping to prevent disease. Pay attention to what's happening in the garden, then research and purchase the best products to fight off pests. Or hire someone to do the job for you.