Argh. Such is the way of city government sometimes, I suppose, but still. Yuck.
On the other hand, the up-shot is that you've at least got something of a path to getting the thing drafted. Petition -> return to council - > discuss - > ordinance?
I'm guessing you're already in touch with folks from other cities who've done this, but if you're looking for more resources, you might get in touch with the Columbia Center for Urban Agriculture. I think they've got folks who were active in making our ordinance a reality, and they could have some good tips for navigating city council shenanigans.