When I chose fruit trees for my garden, I decided to get fruit that was not readily available in the shops. Well, that isn't strictly correct. I had to have an apricot and a lemon tree. They are a given, and I would be unhappy if my abode didn't have these.
But once I had the mandatory trees, I thought about things. I have a thornless blackberry and numerous raspberries. These were already there when we arrived. We LOVE raspberries, but they have been very disappointing. I am currently trying to get these transplanted to other parts of the garden before they start to bud, but I have to make room for them first. They are currently in one of my vegetable beds, and I want to grow vegetables there. However, whenever I have transplanted them in the past, they have taken but died in summer (and come back up in the vegetable bed). The same thing has happened whenever I have bought raspberry plants. The blackberry is corralled into a small portion of the garden. Each year it is stopped from suckering, and reduced to the space allotted to it. It produces oodles of fruit. Besides which, blackberries are expensive in the shops.
Canberra is marginal for citrus. We have a grapefruit that I planted when I came here. It produces oodles of grapefruit most years, and gets a trim back to keep it confined each year. The grapefruit are good, but we never eat them all. The lemon usually has loads of fruit, and we struggle to get through it all, but last year it set very few fruit, so we don't have our usual lemon supply this year. I have a Seville orange - if your orange isn't going to be sweet because citrus is marginal, why not get an orange that is supposed to be bitter? It is only in its third year of fruiting, but it was an excellent choice - I have never seen Seville oranges on sale, and there are a lot of recipes for them, that are often made with sweet oranges simply because the Seville oranges are so rare. So I can make these things with the right orange - and they taste so much better! I have also planted a lime and a cumquat recently because the other citrus are doing well in that area. Citrus is good because it ripens when nothing else is available, and can stay on the tree for a long time.
I have a peach. It produces fruit, but I often don't notice that they are ripe until it is too late. Blackberries, apricots and peaches are all ready at the same time, usually when heat is at its peak, at the beginning of January. So often the peach misses out. We don't really eat peaches (why would you when you have blackberries and apricots coming out your ears?). The tree has had a hard life. Whenever my behind neighbours trimmed one of their trees (since departed), branches fell on my peach. Twice I taped the top half of the tree to the bottom half in the hopes that it would survive. As a result it isn't the best looking of trees, and it has weaknesses, so branches loaded with fruit have been known to break off. It keeps on being told it is about to go, but last year I made some divine peach syrup and bubbly drink that was really outstanding, so it hasn't been cut down this year.
Cherries. I have a sweet cherry (it is the first thing to ripen in summer), and I love cherries. But I also have three sour cherries (Kentish and Morello - they taste different), again because they aren't available in the shops.
Plums. I have a Greengage, a Victoria and a Coe's Golden Drop (if it doesn't produce good fruit this year, it's gone). The Greengage and Victoria are really nice fruit, which isn't available in the shops. They ripen later than the other things, which gives me a longer fruit season. I planted a Japanese blood plum which is furiously blossoming at the moment, and hopefully I will get a few fruit from it this year. It is right beside the peach, so it will have enough room when the peach goes.
So most of my fruit is either non-existent in the shops or is very expensive. There is some point in growing things that are readily available, if they taste better from your garden or if you wouldn't buy them, but you will eat them if you grow them (one way of consuming more vegetables and fruit).