I'm trying to root a number of small cherry branches.  They've been trimmed, lightly dipped in rooting hormone, and planted in a 50/50 mixture of peat moss and perlite.  I have them in pots, covered in plastic, with a grow light on them for 6 hours a day.  I mist them with a spray bottle twice a day, and the soil seems damp-ish...not wet, but not dry.  They've been rooting like this for 10 days now, and most look fine.  Aprox 1/3 of them began to look droopy this morning, and I'm wondering if I need to give them water.  The droopy ones share pots with the ones that are doing fine, however, and I'm worried about upsetting the 2/3 for the sake of the minority.  I'm seeking guidance on keeping them alive in general, and how much I should water them, specifically.  THANK YOU in advance!