For containers you can do oranges, lemons, limes. etc. and bring them in for the winter.
I don't know if the trees you started will do ok in containers because, for instance, apple trees grown from
seed get to be very big. Maybe if you trim the roots like they do for bonsai it will keep them from overcrowding themselves.
Strawberries are good in containers. And herbs can be grown in windowboxes, along with greens like the small bok choi, lettuces, etc. I used to grow nasturtiums in mine.
If you're good about
watering, maybe you could put some wintergreen in the planters with the trees. It's a creeping groundcover that makes tasty berries. You could also plant the smaller herbs with the trees - like thyme, oregano, etc.
You can buy tea plants to grow in containers. They'd need to be brought in for winter too.
I used to have a lot of fish tanks. The fish waste I got from cleaning out the filters, which I did weekly or every few days, was excellent fertilizer for my container plants. They grew better than I've ever grown anything. When you squeeze the filter (I used sponge filters) you get this rich dark brown, earthy smelling
water that's full of bacteria and life. With that mixed in with water I took from the tank I could turn sickly plants that were nearly dead to thriving healthy plants even using worn-out years old potting soil. If you think you'd like to go that route, goldfish make the most waste. They can live out on your patio too, in a plastic tub.
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