picture of aphids on leaf in garden . Warm temperatures are great for helping your plants thrive and grow, but they also, unfortunately, create a welcoming environment for pests to move in. And right now, it's aphid season. If you've been a gardener for a short time or for years, you'll have no doubt come across aphids in your garden. They're minute insects that enjoy feasting on your plants and can become a big issue rather quickly.