Bees are the most important pollinators on our planet. Without pollination the world would have no food, so it is important to grow flowers (that honey bees feed off) to support their population.
Supporting the bees will benefit your vegetable garden too. When there is a lot of bees, your vegetables will grow abundantly and your trees will fruit properly. So, if you feed the bees first they will pay you back with more food in your garden than you have ever seen.