That is what I was told to do,I use a gas soldering iron to cut mine as it stops it from fraying,but if you are gonna plant onions I would cut a hole the size the intended size of the grown onion,if this is your first time using the fabric you will have to peg it down with something till the plants get to a reasonable size as when the wind gets under it it can strip your young plants as it waffs up and down,what I try and do is when I have cut the cross I use a bulb planter to catch the edges and push the edges down then drop my plant in and overfill a little so the flaps are buried