Are there any large farms (or even small ones) whose entire crop is Catnip?
Also, does the plant (Stinking Goose Foot) affect dogs in much the same way as Catnip affects cats?
I couldn’t find anything about a farm exclusively producing catnip, but did find a cite which said that Oregon produces the largest crop of mint in NA. Since catnip and mint are very closely related, it would be good to try there first.
Catnip +farm crop gave me 1,800 hits on Google. Random examination indicates that most farms producing catnip do not have it as an exclusive crop, but grow it either as part of commercial herb farming (particularly organic farming) or as a profitable side venture that provides pest control of their principal cash crop – it appears to have some pest-repellent qualities, according to a couple of sites, though I didn’t see anything particularly definitive proving that.
Google:
Iowa State University catnip roaches
In Portland, I recently bought some catnip toys from a woman at the Saturday Market. She said she grows two and a half acres of catnip. Does that count?