Oasis foam is a brand name, so I probably shouldn't use it, wallyworld has floral foam in crafts dept(expensive sub). Foam is sold in sheets to fit nursery grow trays, even has holes for seeds of that is your thing. Have seen in grow stores but expensive, and I am camera shy. So it's the one thing I internet, it's a pain with all the sneaky-sneak, so I buy a case every three or four years.

Main thing to me, it's sterile, and holds water nice.Attachment 296005

I usually only do forty at a time for headquarters, which only takes maybe ten girls that are ready to go to the bloom room, but it's easy to increase the number of someone wants a sog.