My wife and I frequently walk in the same location in Norfolk, UK, and every year in spring and early summer we find hornets in the same location. They are on a couple of ancient and very large oak trees and appear to be in places where the bark is broken or is holed. I thought they were feeding on tree sap but wonder now if they are chewing the bark for nest building. Is June too late for that?
Though hornet nests are built in spring, they are often enlarged during the summer. Therefore June isn’t too late for the workers to gather bark and wood. They often add more cells to the nest in the summer, enabling the colony to grow. The hornets that you see on the oak trees may also be feeding on tree sap through holes created by woodpeckers.
Updated on June 9, 2018
By Linda Crampton