I tried a search but I might not have termed it correctly. So I am sorry if I missed it.
I am using the 72 pop out planting cells to start my tomatoe plants. I intend to plant 4 different varieties. I ended up purchasing the jiffy 5227 seed starter. I thought about masking tape with just a letter or number but I think with moisture it may not work.
Is there something that is designed that will mark the thin pop out cells?