Honey Flows
Honey flows, also (and more accurately) called "nectar flows," are times when a large number of flowering plants from which the bees can draw nectar are in bloom. Depending on the location, there will be one or more honey flows. Generally there is at least one major honey flow in early spring and one later in the summer. In some locations, there is also a honey flow in the fall.
You may be interested to know what plants provide nectar for honey in various countries throughout the world. For a short list of countries outside North America and the plants sought out by beekeepers in those countries, see Honey Bee Nectar Plants Around the World.