I don't so much watch birds as a hobby, but because of my interest in gardening, and especially native species, I've taken pains to arrange my landscape so plants produce food recognizable by the local bird population.
It's not that difficult to do really, and the plants that are native that will provide food are usually more easy to care for in the landscape anyway, since they're already adapted to weather and soil conditions.
I've done a lot of work in my area helping others shift their landscape in ways that will support the local species. My community was the first registered Community Wildlife Habitat in the SE U.S. We worked with a lot of homeowners, businesses, and owners of other land such as churches and apartment complexes in that effort:
It's easier to accomplish than you think, and you can get good free advice attuned to your area from the County Extension Office usually.