Alright folks, I was wondering how much support I would need for a 12'x12', 2' high raised-bed box using 2x12x12 boards?

id say a support bean every 2 foot squared! if ur growing on it! cuz thats alot of weight!

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it will be on the ground, I was kinda talking about how I would reinforce the sides of the box, sorry didn't specify in first post

cedar post or stone every three feet sunk two feet deep would do it re bar too as it impart iron to the soil

Yeah, rebar is what I was thinking as well, thank for repling everyone.

rebar is the fastest, easiest. 2 per conner, 1 to 2 per centers. Just wiring the rebar in place is good enough until you get it filled with soil. It's hard to reach across a 12' area (6 ft. from sides.) 6 ft' wide would be better for me.