There are still some Oak Leaves on the Bur Oaks and maybe a different kind of Oak trees around the area, you can get for free. Most places don't spray trees. You can ask the park maintenance people, homeowner, etc. about using any spray, etc.
For my uses, I like the oak leaves better than Indian almond leaves, they degrade nicely and the shrimp and fish pick at them until there are just little leaf skeletons. They also don't turn the water as dark. The Indian Almond leaves I got turned black and disgusting, maybe they were just poor quality. So depending on what you need them for... I didn't need them for blackwater, just for my shrimp. Also, I tested them out just to be sure with some cull shrimp. White Mulberry leaves are good and can be found around here in Summer too.
