Viburnum flowers look like you’d be putting out plates of food for the bees. However, we are finding only a few references that bees use the early-spring blooming varieties when there is little else blooming and the fall-blooming varieties for the same reason. Some reports say that the bees are gathering pollen. We squirrels are by no means experts on bee foraging, so perhaps inspect the viburnum flowers when you pass by them?
Viburnum is a shrub that flowers at the tips of the branches. The flower heads are large and flat with many small flowers inside the petalled edges. Below is Doublefile Viburnum, Viburnum plicatum.
And this viburnum with the leaf that looks like a maple is American Cranberry Viburnum, Viburnum trilobum.
The Honeybee Conservancy likes one of what Ms. Flora calls the ‘fancier’ versions of Viburnum, so check that out here.
There are enough varieties of viburnum that you should check the specific sun and soil requirements of each, but in general, the more sun they have, the better they will bloom, but partial shade is usually tolerated. They can reach up to 8 feet high and be even wider, to 10 feet.