I am a college student taking a "Growing Sustainably" gardening class this coming spring semester. This class meets every Friday and I do not think that I will be able to go to my university's farm outside of class (it is not in walking distance and I do not own a car). I am interested in growing heirloom plants, such as those from the Seed Savers catalog. Also, I have past gardening experience, so I would like suggestions beyond super-easy things like beans and radishes. What do you suggest?