I guess this is a bit like a variant on the old "how many acres per person?" question, but a little more relevant. It's probably not so much of a permaculture question as a it is a self-reliance question. So think of it that way rather than getting too hung up on the deeper pure permaculture ideals. I know it's bit of a hypothetical but ballpark figures are fine. So... How many of each thing do you find is sufficient, lets say for a family of 4? By this I mean how many strawberry plants do you need before you find yourself leaving fruit behind because you just can't eat, preserve or otherwise use any more. How many almond trees gives you enough for all your almond needs. Do you need more than one lemon tree? Are you satisfied with what one good mandarine tree gives you? Feel free to allow for a little surplus for your neighbours and friends without getting too concerned about it. I'll start. Apricots: In a good year (when we stop the birds) we can easily use all of the fruit from one heavily laden apricot tree. We eat nothing but fresh apricots for a short while, bottle as much as we can before they go too soft, make a good batch of jam and perhaps even bottle some puree. But the bottled stuff is well gone before we get around to the next harvest. I reckon we could easily go for a second tree for more bottled stuff provided we had the time to do it. A later variety perhaps, with a second bottling. More than two trees would be too much. I look forward to hearing your experiences. How many [Insert here] do you have and do you find yourself thinking you could do with some more?