Where are you? If you are in a state with live oaks or similar, you can use live oak leaves [or water ok/laurel oak] I collect them from round my neighborhood in March and use a deep layer on my garden where my ducks free range. The ducks love them -- foraging for bugs and scattering the piles when I am first tipping the sacks out. I put another layer out on top at the beginning of September and have more stored for renewing in late December.
I find this so effective, this year I invested in big wheelie bins to store the leaves as black plastic trash bags start to deteriorate after a few months in Florida heat. The photo shows the leaves earlier this year. If you have a run smaller than my back yard, you wont need to gather as many leaves as me!! Second photo my van with gather leaves from March 2021