If we are leveled to the point where we need the large pot then it should avaliable to us so we can keep progressing. I am at that point now. Of all the things that come into being in the game, I would the large pot would one of the simplest to achieve! As it stands I would have to buy a house or castle to go further and that is more expense than I can afford. And if I had wanted one I would have already gotten it.But then, maybe they didn't forsee players getting this far this fast. I just hope it appears soon!!!! The idea of making it drop doesn't sit well with me since I don't want to have to battle the same thing over and over to get it. The rest of the gardening things are generally avaliable and this should be too.
Wizard City housing is what...8,000 and 15,000 gold? this is not expensive at all. and the enchanted large soil plot is like 25,000 gold in mooshu if i remember right. Gardening can be quite expensive beyond rank 7, so ya might want to think about how much time/effort you want to devote to it. in the long run, its totally worth it. you want to make money cheap? fill your dorm room with 20-25 stinkweeds. these make money hand over fist selling the treasure cards you get.
To garden in your dorm, you need to obtain a pot that is the right size for your plant. If you are a level 15+ and have above 8,000 gold, you can buy a castle from Buxley Turtleton in the Wizard City housing shop near Elik's Edge in the Shopping District.
I really do think that we shold have a Large Pot and Enchanted Large Pot. I'm a Rank 8 Adept gardener and I have obtained many plants that require a large plot or large enchanted plot. I may have over 60,000 gold, but I don't want to spend it all on gardening! Large Plot and Enchanted Large Plot are extremely expensive, so I think we should be able to buy or collect a Large Pot.
Like everyone else, I assume you mean to garden in the large pot... I thought I saw a vendor in Kroktopia - take the air boat to the island where you can access the myth tree and the sphinx - the vendor is standing near the House / Houseware shop. I know he sells pots but not sure they are more than decoration...