What's a great snack for a ladybug? Raisins! Here's how you can give your ladybugs this treat. Soak 1 or 2 raisins in water. Blot them dry on a paper towel. Cut the raisins in half and drop them into your ladybug habitat. Replace the raisins as needed. If you have any aphids on leaves in your garden, you may place the leaves in your ladybug habitat. Ladybugs love to eat these harmful pests!