Herbs, especially basil, parsley, asparagus, snap peas, beets, kohlrabi, burpless cucumbers, pickling cukes, raspberries.
I have one major addition to those categories: How much time do I have to spend on it? Asparagus, raspberries, and artichokes may take up a lot of room, but they require almost nothing from me but harvesting. And they're really expensive in the stores because of it and the shipping required.
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