this one is in my back yard..I assume its a walnut ( don't know which) and will make the soil under it not so great to grow anything else..correct?
took this pic at the zoo, just curious what it is since it was not labeled..
IMHO, first picture kind of looks like a butternut (juglans cinerea) which is a close relative of black walnut (j. nigra).
Second one looks like it could be a goldenrain tree (Koelreuteria paniculata), which is not native.
First one is most likely eastern black walnut, J.nigra.
Butternut is not at all common ANYWHERE in KY.
I have some - and some hybrids - growing here, but most folks - including a friend who is a consulting forester, have never seen a butternut 'in the wild'.