jhouse, there is one sure way of finding out if they need to be potted up. Take one plant and it looks like Styrofoam cups, so carefully remove the plant and mix intact. If there are a lot of roots on the outer surface where the cup was - pot them up. If not, put it back in another cup of the same size.
I am not more experienced. With gardening, it's a never-ending experience of learning and adapting. (My 2 cents) I think giving away plants that are already hardened off is a good idea. Some might not know how to harden off plants.
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