You can get away woth much smaller pots for peppers if you know what you're doing. If 5 gal are easy to come by then use those. Peppers don't mind being root bound if properly fed, and usual recommendations are vastly oversized, probably by people who've never tried growing in smaller pots. Jalapenos are incredibly tough, they can even take my clay soil without problems, so whatever you do they are really hard to kill.
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