Catnip Farming

How much space should I be demanding from the bunnies for my hopeful catnip crop? They're trying to insist that they need extensive space for their carrots, and goodness knows how much space they're going to take up with those 1000 squash seeds. So, where can I poke the catnip? I do have some already, of course, but it's just one small clump, not enough to really start a proper market for my product. So, how many carrots do you think I should be planning to evict in order to open my farm for crops?