Companion planting is a great way to deter pests in our garden, specifically for summer squashes. Some plants repel pests like aphids, whiteflies, melonworms and pickleworm. Others are better suited as trap crops, attracting aphids, squash vine borerers, squash bugs and cucumber beetles so we can remove them from the garden and destroy them before they get to our zucchini or yellow squash. It's important to know which pests we're dealing with so we know which plants to use and how to use them. And I'll bet many of us have used one specific plant incorrectly as a companion plant for our area, and that includes me! Let's dig in to the best, and worst, companion plants for zucchini and other summer squashes.