on my first lid, I drilled 13 1.25" holes, too BIG, that's why the toothpicks thru the plugs in photo :wtf: ... in my newer lid, I drilled 1" holes, they worked better ... the roots grow thru the plugs, down into the reservoir ... last crop, I vegged 6 plants in that box for over a month, while waiting for a vacancy in my flowering cabinet ... got pretty crowded, lotsa roots grown all together, no biggie ... I snipped them apart with scissors, and trans-planted ... :jointsmile: