Fall is a good time to do an inventory because some flowers are still blooming, and those that are past their prime still can be identified by leaf shape and structure, among other attributes.
Birds & Blooms on MSN

Should You Feed Birds Year-Round?

As the seasons and weather conditions change, switch up what you're serving in your bird feeders to attract more birds to your backyard.
Backyard birds may seem ordinary, but there's more than meets the eye. Our database shows you the top ten birds in your state.