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I think your best shot is a Meyer lemon, calamondin orange (kind of like a Key lime with orange-y pulp) or a sweet laurel (bay leaf) plant/tree. Keep in mind that they will always be potted indoor plants because none can take the bitter cold.

You could start an avocado from the pit of one you've eaten, but it will never bear fruit.

Plants/trees/shrubs that bear nuts/fruit/flowers and that can handle subzero temps usually can't be adapted successfully to indoor growing, and vice versa. But it's fun to try to get the best of Mother Nature. If nothing else, you'll have something green that will help filter and add moisture the dry air of the condo in winter.

I have had a meyer lemon tree in a pot by the front door for 7 or 8 years. Got 31 lemons from it last year and it's only about 4 feet tall. Its flowers smell wonderful and it's always green. Just be sure you can bring it indoors in the winter!

I also have a Meyer lemon tree in a large pot, which I bring indoors when the temperatures hit around 40 degrees at night. I have had it four years, and although it blooms profusely and smells heavenly, I have not had much luck with it bearing fruit. The first year I got 10 lemons, then five, last year nothing, and right now there's one piddly lemon that's been on it for two months now and staying green. Potboiler and Olddad, can you tell me the secret to actually getting lemons from this thing? When I bring it in, it does stay in a sunroom.

@gourmetgal - I've had a lot more lemons when I fertilize the plant - I use Peace of Mind - it's an organic plant food and comes in a citrus version. Also, I have found that thoroughly watering the plant once a week is the best way to go. Finally, my lemons ripen in January - takes a looooong time. Hope this helps!

Thanks for the ideas! Even if it doesn't bear fruit, just the nice smell of a lemon tree would be nice!

I have a Mexican Lime and Blood Orange in pots on my patio. You can find dwarf trees for most types of fruit. Good luck!

These apple trees are grown for patios and small spaces. But you'll need two varieties to get fruit, unless there are other apple trees nearby that will cross pollinate. They're hardy to zone 4, which should be fine where you live. Check your zone here. And they ripen in September, which is also good. Some fruit trees are hardy, but don't ripen until late October or November - by which time the cold has destroyed the fruit for us northerners! (Granny Smiths, for example.)

Here is some info about growing potted fruit trees. You can also talk to your local cooperative extension. Putting the trees up against the wall of your building will help in the winter. And if it's a south facing wall, that's a big plus! Espaliered fruit trees are grown against south facing walls. (The Sentinel trees I linked you to are basically a single cordon espalier.)

Perhaps wrapping the pot in insulation, like you would use for a hot water heater, might help it through a particularly cold winter.

Meyer lemons are amazing. The best lemon meringue pie I've ever had was made last winter from lemons from our potted tree. Floral, complex, ethereal, amazing.

I'm eyeing the lemons now, for an encore this winter!

If you are planning on growing apples or other cold hardy fruit trees, you will need to expose the tree to cold weather during its dormancy (winter) in order for it to fruit the next year. The main problem with having these trees potted is that their vulnerable roots are exposed to temperatures that will either kill them or damage them. As others have suggested, insulating your pots can help. Another method is digging a hole outside big enough to fit the whole pot. Just pack it in nice and snugly and it should make it through the winter just fine. If you are looking into creating a potted garden with a mixture of trees, herbs, fruits, and veggies, I suggest "McGee & Stuckey's Bountiful Container". It is a great resource for growing a wide variety of yummy things in containers.