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Hi, I am new to bonsai and plants. I planted a few sprouted apple seeds a while ago and the growth was great! However recently it seems that growth has stopped and the leaves (apart from one seedling) are starting to wilt. I did put them outside in full sun for 2 days recently before reading that that is bad for them

If it wasnt the sun (as growth was stunted before I put them outdoors), what could it be?

Any advice and info would be greatly appreciated