You're really going to have to test the soil to see. My veggies are under a huge pine tree. My neighbor's tree, so I can't cut it down either. There is a fence protecting them, but obviously the roots and the falling needles don't care about that. Every year, my garden is covered in fallen needles. I assumed when I set it up, that the soil would be ridiculously acidic. I was all set to add all kinds of base to my soil to make it better for the veggies. On a whim I tested it and boy I'm glad I did! It was about a 7 on the nose! So all this is to say, don't assume anything even from am educated guess. Test the soil.
