They are super wet (I literally get sprayed when cutting on a tablesaw!) and SUPER soft - with a little wiggling I can pull a #8 screw right out of the board. The boards are only 5/8" thick, so when screwing two of these together a 1 1/4" countersunk screw pokes out the other side, so I'm only using 1" screws.
Is there some trick to fastening these so they won't pull apart? I'm planning to put a few bags of soil into this box and I'm afraid the weight will just rip all of the screws out.