I don't know if you can buy seeds other than from the Bazaar, but it would be nice if you could sort them by rank. Similar to how you can with pet snacks.
This would be really nice for when you want to buy some snacks because then you can get one for your rank. On some of my wizards who haven't gardened yet, I could easily get to the rank 1 seeds. For people like my fire wizard and are masters, I could easily find rank 7 and 8 snacks.