Anecdotally, they seem to be dependent on the zone you're in.Also, I'm not sure if recipes you receive are dependent on the zone you're in, unless somebody has done comprehensive research on the subject.
(That means gathering data and analyzing it)
I agree. I went back to Khenarthi's Roost (level 4 starter zone) and i'm finding blue recipes according to my character and provisioning level and skill.Provisioner recipe 'drops' from furniture (which is what I was original intent behind what I was asking) are dependent on the CHARACTER level.