Quick question about tree saplings

I'm new to this guy's, I bought 15 or so dogwood trees off an online website planted them in pots to see which ones would survive. ( Chicago land area)

I planted them early spring some never bloomed and some bloomed and died (it got to be 95° here for a week right as they bloomed) the leaves turned black and then died? and the others are still growing today. (All the green trees I transplanted into the ground today) And some of the trees just started to show green leaves in the past few weeks blooming lately (these are still in pots)

Ok my questions.

1. The ones that never bloomed do you think I should try to see if they bloom next spring? Or toss them?
2. The ones that bloomed a few leaves then shriveled up. Is there a chance of them coming back next spring or are they gonners?
3. Will the trees survive in pots over winter?