Hello Hayden. I guess first make sure the names of the color attributes are exactly the same as in the nodes, letter caps and dash signs and everything, perfectly the same. I can’t tell by the screenshot because it is too low res.
After that check you assigned the same material to the other trees, one of them being white can mean it doesn’t have a material. Also check that all the trees each have the same color attributes in them, because if they don’t have color attributes by those same names, the nodes in the material wont work. So select each tree and go to their respective color attributes menu and check they each have one. And finally try turning up the world strength so that your scene can be better lit, right now it is very dark and hard to see what is going on.
Hope this helps you.
