We used to grow our potatoes in big buckets to save space. (You plant them at the bottom with a little earth then keep adding more earth as they grow. If you feed and water through the year as well, you can end up with a bucket full of potatoes from top to bottom.) Cherry tomatoes in hanging baskets, a great space saver, (which are unbelievably tasty and easy to grow) and blueberries and salady bits (like lettuce, dandelion and pak choi, and rocket) in the ground, but all these can be grown in pots easily and you can bring your dandelions and chicory indoors for forcing(blanching). Best of luck!