I've been practicing in the yard, and the welded loop ended up splitting near where the loop was welded back to the mainline. I'm guessing the grass did this
If you are still around, Brian, you want to make sure you tie some yarn or a little strip of rag or something to the end of the leader. It will help to save wear and tear on the loop as well as the leader itself.
Much of Florida's grass is more like vines with grass sprouts growing from them that are very stiff and that wear fly lines pretty quickly. It often has a mix of sand spurs and creeping charlie mixed in that are also not nice to fly lines. Add a liberal sprinkling of coral dust and particles and salt crystals on and in it and it's not the best environment for fly lines.
The grass up north is much softer and less abrasive. So yes, grass can cause varying degrees of wear depending on the environment.