Landscape fabric is what you want to use. It will block growth but let water through.

Geotextile cloth or landscape fabric works but so does just using the firepit regularly.

I agree with just using your pit regularly, the heat will keep anything from growing there. If you are worried about setting a root on fire just do like you said and dig down a bit and put in a layer of rock as a barrier.

Thank you. This helps a lot

Unfortunately I don’t use it too regularly. Mainly in nights I find myself not needing to wake up at 0300 the next morning, which isn’t often. So it tends to get wild there during the mid to late summers

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this.. also known as weed barrier cloth. you can get it at the big box stores.