I find with zucchini that I plant seeds for four plants each year. Often at least one dies while it is small, but never all four. Once they are a reasonable size, I pull out any excess plants - I can always do with room for a few more Chinese vegetables.
I have a 700sq m block with a big house on it. However, we have 3 plums (2 way blood plum - had its first fruit last summer, greengage, coe's golden drop - which never has anything worth eating, victoria), cherries (3 sour, 1 sweet), apricot, peach (threatening to get rid of it each year, but it is prolific), 8 apples (started producing last summer), lemon (usually we have a lot, but this year there aren't that many), grapefruit, bitter orange, lime, cumquat (the last two are small and haven't had fruit yet), hazelnuts (started producing last summer).
I have a problem with raspberries. They grow where I don't want them, and don't where I do. I have bought raspberry canes two years running, and they all died. This winter I plan to transplant all the rogue raspberries. That way we might get fruit (they are all together in a place we ignore, so we don't find the fruit).
I have a "perennial vegetable" garden as well as my raised beds. The perennial one has rhubarb, jerusalem artichokes (grow like weeds), ordinary artichokes and asparagus (need more plants) with raspberries at the back.
The raised beds are for annual vegetables.