Since there is no code specifically for marijuana manufacturing, I suggest using code 339900, Other Miscellaneous Manufacturing, for your manufacturing business. (I assume that you truly mean manufacturing, not growing, which would be farming.)
Is your business a sole proprietorship, single-member LLC, multi-member LLC, partnership, S corp, or C corp? Are you asking about your personal Form 1040 tax return or a Form 1065, 1120, or 1120-S?
