I doubt any of the mentioned fruits can survive in your zone if grown in pots. They must all go through the dormant stage.
Keeping the plants alive in pots on the deck will be difficult if the roots are not below ground level. Roots must grow below the frost line.
You won't be able to bring the pots inside for the winter as they will break dormancy.
Blueberry love acid soil and some varieties need a polinator. They are slow growing and it may be few years before they bear a good crop.

What else can you tell me? I realize I'm asking pretty general questions. I live in Massachusetts in Zone 6. I have no idea when blueberries form or are ready to pick, if I should prune them, etc.

Blueberries flower in the spring and ripen fruit late summer-fall. Blueberries generally aren't pruned for a few years. After that pruning to remove the oldest canes is done to keep up productivity.

Apples are pruned to make a good shape for fruit bearing. Generally you want branches angled slightly upward from horizontal. Remove any crossing branches. Your tree should arrive in need of no pruning and at least for the first year I wouldn't touch it. It needs to put out new growth and leaves for energy. Wait until the following year or more before pruning anything. In that time you can review the info on various pruning techniques and get comfortable with the idea.

Spraying really depends on how things go. Many who grow fruit trees would spray preventatively as they know fruit trees are magnets for pests and disease. It's up to you if you choose to wait until you see a problem. There are organic sprays you can use. Up to you.

For your in ground plants feeding them organicly is reasonable, but for your container grown plants a water soluble fertilizer is preferred. Water soluble pretty much means synthetic. You want a fast draining potting mix (see the container forum for details) and things like compost just clog up drainage in a container. In the soil they are wonderful, but not in containers.

Products like fish emulsions also don't have much 'oomph' in containers. They require processing by soil organisms before nutrients are available to the plant and more often than not the container plants are watered frequently enough that it is all washed out before this happens.

It is your choice, of course, but many of us, myself included, who are organic growers in the soil have found it very difficult to get satisfactory results with organics in containers.

You will find more info on the container growing forum for the plants you intend to grow that way. The apple tree and blueberries have chill requirements which means they need a period of cold to do well the following year. You can bury pots in the ground or bring them indoors into an unheated shelter such as garage or shed for the winter and then gently reacclimate them to the outside once you see signs of new growth in the spring.

Thank you! I can sink the blueberry pots in the garden soil for the winter and the first year or so I can bring the apple into the garage the way I do with the fig. Maybe I should find a spot in the yard for the apple and just put it in the ground to avoid that problem.

I sometimes do use a regular slow release fert in my pots of foliage and flowering plants, but not in the fig because I eat them and wanted to keep anything I consume totally organic. Maybe I should do some research on other fertilizers for the potted plants as I did run into some trouble with the fig getting low on potassium and had to add some. I didn't realize that about the fish/seaweed emulsion and pots - that's good to know. Thanks!

Lisa

I've never had problems with my potted blueberries. I just dragged them into my non-heated garage for the winter and they were fine the next year. This year I left them outside though and they got eaten by rabbits :P