One of the trees on this property is a horse chestnut tree. I don't think that they are edible chestnuts, but I've noticed that this tree is the absolute favorit of the local native bumblebee population. It is constantly humming with bumblebees and with hummingbirds. No other tree gets the attention that this one does.
It provides an interesting contrast to my domestic bee colonies; the native bumblebees will fly at much lower temperatures, and much closer to dusk than the domestic bees.