When entire trees began to show colors, particularly white, this is an indication that the black locust and wild black cherry trees are in flower.

Yes, tall trees, almost all trees, produce flowers but most tree flowers are small and don't have showy petals and other parts. There is a reason for this variation, a method in extremism, so to speak.

Trees, the oaks, walnuts and birches, produce tiny insignificant-looking flowers because these trees are wind-pollinated. The wind doesn't care what a flower looks like. Wind carries any light pollen everywhere.

If a tree relies on animals, including birds, bees, bats and insects to carry pollen, the tree needs some feature to attract the animal to the flower to pick up the pollen. Usually this pollen is big and heavy, relatively speaking, and the animal must at least believe it is getting something in return. It almost always is.

Pollen can be food; nectar is food. Hummingbirds associate red with nectar, so red flowers are often associated with hummingbird-pollinated plants.

Bees of all sorts are seen visiting white flowers, like those of cherries and locusts. But bees are not very active until warm weather, so white tree flowers open when bees are likely to be most active.