>>2088663I dunno, after mixing some yard dirt (some amount of clay in it) and plenty of water with potting/seed starting mix they seem to hold together mostly ok. Literally my first time doing this so I don't know how it will do as far as growing.
>>2088662hacksaw, flat file, drill, etc. only tools any self respecting man or girl (male) ought to have on hand. Only had to buy the aluminum flat stock. I skimmed
https://www.instructables.com/How-To-Make-a-Soil-Blocker/ first but then just wung it.