At Mt. Diablo Nursery & Gardens we encourage the use of sustainable and organic products. Using non-toxic and organic pest control and fertilizers are good for the environment. The use of toxic pesticides and herbicides eventually results in stronger and more resistant insects, bacteria and fungi. And of course, if you're eating the vegetables and fruit you've grown, you want to know that it's free of harmful chemicals. For these reasons we want to always have organic, sustainable options available to you.