Same As It Ever Was

You may ask yourself-well...how did I get here? Still lost on whether it's a turnover if the disc touches a long piece of grass/weed??

From UPA's Official Rules - 10th Edition:

:Field of Play :
3. The playing field and surrounds should be essentially flat, free of obstructions, and afford reasonable player safety. Well-trimmed grass is the recommended surface.

:Receiver: Any offensive player either in the act of catching the disc, or not in possession of the disc.
6. If a pass arrives in such a manner that it is unclear whether a catch was made before the disc contacted the ground (grass is considered part of the ground), the player with the best perspective makes the call.