The first thing in garden making is the selection of a spot. Without a choice, it means simply doing the best one can with conditions. With space limited it resolves itself into no garden, or a box garden. Surely a box garden is better than nothing at all.
But we will now suppose that it is possible to really choose just the right site for the garden. What shall be chosen? The greatest determining factor is the sun. No one would have a north corner, unless it were absolutely forced upon him; because, while north corners do for ferns, certain wild flowers, and begonias, they are of little use as spots for a general garden.