I do a no pesticide garden and insects are a part of it. It took me 4-5 years of not giving up to reach a state of equilibrium. The first two years, the losses were devastating. Plants were regularly eaten by unwanted insects like aphids and cabbage white caterpillars. And I had to keep adding more plants. Now I have 70+ plant species in my small backyard and the beneficial insect moved in. Spiders, ladybugs and wasps now take care of any infestation before it becomes big. And the ones that stay small are now just an acceptable part of the garden’s lifecycle.