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I'm not convinced that an airtight grain storage facility filled with carbon dioxide is impractical. A quick search turns up several manufacturers of airtight grain silos.

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In fact, you don't even need the silo to be air-tight: moisture is the enemy. If you can keep you silo dry (including when air temperature change, which is really the only challenge you would face, for example in the ancient world), you're good[1], it won't rot.

Humans have known how to keep wheat for several millennia !

[1]: at least if the goal is to eat the wheat. Replanting the seeds will become much harder after time passes.

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