To get maximum yield from a food forest, or garden, we need good pollination. Many pollinators exist regionally, as well as the plants that attract them. What works here in WA will probably not work in TX, or VT.
The Pollinator Partnership has taken a lot of the mystery out of this. They are using a sub-system division of the US into hundreds of unique regions. Each state is divided into multiple ecological zones. For each region, they list the pollinators, and their attractants/food sources. If you go to their website and plug in your ZIP code, it will display a 24 page PDF booklet specific to your region.
Their site is here:
http://www.pollinator.org/guides.htm
Hope this helps you "bee happy".