To control aphids on your plants, you can consider using natural methods such as releasing ladybugs or lacewings which are natural predators of aphids. You can also spray a mixture of water and dish soap on the affected plants to help get rid of aphids. Additionally, you can introduce companion plants that repel aphids, like marigolds or garlic, to help keep aphids away from your plants. Regularly inspecting your plants for aphids and removing them manually can also be effective in controlling their population.