Since you grow your own catnip, this is a prefect tool and a perfect time to get the cats to interact with play sessions. But, still, you want to focus most upon kitty's elimination issues first.
I have a skittish cat too, she's really quirky, but I love it about her, and I did have some inappropriate urination problems with her when I first rescued her. But, time and patience paid off, she uses her litterbox faithfully. It was a lot of trial and error in those first few months, but she needed love and patience more than anything, that helped greatly in getting her to eventually use the litterbox. The main issue I learned with her was that it was almost strictly kitty litter I should have focused on in the beginning, she refuses to use any type of kitty litter at all, it absolutely must be, ...paper towels folded over in her box
![Rolling Eyes :roll:](./images/smilies/icon_rolleyes.gif)