I personally don't like introducing non-quarantined food to my tanks. This is especially true of garden/lawn food as if any herbicide/pesticide was used you can transfer those chemicals to the tank. If you want to go this route I'd QT the food just like any fish in clean soil for a couple weeks.
I know a lot of people like to do this (I used to catch tiny crickets and feed them to my tiger barbs), but I've stopped feeding wild-caught food directly unless it's been in QT.