idwaneo wrote:Even if they are from leaf cuttings 4 months old? Will they die if staying in a south facing open balcony?
Leaf cuttings are very different from baby flytraps started from seed. Typically leaf cuttings will quickly grow into a mature plant. Seedlings stay very small for many months and can easily burn. I wouldn't hesitate to put a leaf-cutting out in full sun, but would never suggest doing the same for baby flytraps.
idwaneo wrote:Also live sphagnum moss will it burn if in full sun or it will do ok? How do I know if moss is burned?
It will typically brown at the tips of the moss if put in full sun. The browning of the tips is an indication that it is "burning" (i.e. receiving more sun than it likes).