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You can easily cover a carport and turn it to a real greenhouse, all you need is wood running boards along the bottom, you can use 2x12 instead of cement footings and its heavy enough to hold it in place. Then just slap a piece of poly weave on, secure it to the wood framed footing via one foot pieces of 1x4 all the way around and you're in biz. Build end walls out of 1or2x4 to mount fans and intakes and call it a season. If you need more anchoring support, you can use the tie downs the carports come with or pound in some grade stakes and secure them to your baseboard/footing.