Around me there’s a (non-native) pear tree (Prunus calleryana) which is the primary tree in old neglected fields with poor soil. I wouldn’t mind if it bore edible fruit, but alas those hard little pears are astringent to the point of being painful. The Eleagnus umbellata I don’t mind however, as they build the soil and the berries are delicious and produced in copious amounts. The bear like them, too.