On the side of a volcano so our soil is very fertile but doesn't hold water at all.
So we have tended to go with lots of herbs, being expensive to buy but easy to manage. Veges are reasonably cheap and fresh in the supermarkets over here. Citrus do well so Lime, Orange and Lemon trees, a Bay tree for bay leaves of course. Rosemary, sage, garlic, mint, oregano, parsleys, thyme, dill, chives. I've just put in a watering system for capsicums and chillis in an area that is normally bone dry.
I had to do a lot of mulching and composting to get some of the soil to hold water finally. Plus we have an avocado tree and an olive tree, neither of which have produced much but are very shady and decorative.
A poor soil area is also now covered with wild strawberries which was a throwout from a couple of hanging baskets, accidental bonus planting.
About the only vege I can grow is self seeded spinach up in the watered area.
We use a lot of herbs, limes and lemons so we do quite well cost wise for the investment we've put in.
Also collect rainwater for the deck plants, probably full of bits of meteor dust off the roof.
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