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No, it's not the same as Preen (at least not the regular Preen--I think I've seen a new organic version of Preen that does have corn gluten, but the regular Preen has a different active ingredient). It performs the same function though--both act as pre-emergent herbicides. I can't speak from experience whether corn gluten is more/less effective than the regular Preen, but if you can get it cheaper it's certainly worth trying.