have to be careful with those double cups, if water stays in there too long, the water is also inside of the inner cup- soaking the cutting... I am very worried about that, because I killed a very special cutting by not checking ...upon watering, after a few hours, should go through and take all the excess water from the second cup... I leaned to put a few pieces of styrform or some bottle caps in the outside cup, that way there is room for the water to go, without soaking the cutting - until I can get to them.