Thanks to intensive monoculture-based farming practises, pristine green flowerless lawns and the destruction of native landscapes, bees have lost much of their natural habitats. You can help rectify that by planting bee-friendly flowers and flowering herbs. You don't have to spend fortunes getting these flowers. Seed packets of wildflowers are inexpensive and easy to grow. Do a little research and see what grows well in your area, and plant plenty of the same flower together, bees love feeding in mass! A few examples are: lavender, cosmos, poppies and sage. For more suggestions, visit this list from honeylove.org.