Certified organic wheat straw
Cover the soil. That is the whole job.
Mulch is not optional in a living soil. Bare soil dries out, crusts over, and the top inch stops working. You can cover it with almost anything and be better off than leaving it open.
So here is the honest version. If you have clean leaves, spent cover crop
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Straw mulch
My plants were outside this year .I started using the straw for a cover and moisture buffer
What a difference within a week !!
Cant wait to get a grow going under the lights !