I planted 10 Blue Agave seeds on my 5 acres in the WA wheatbelt about 4 years ago and they are now 1 meter radius and growing pups. I dont know if this is good results or not but I thought I would post this. They have lived through 0 degree frost in the late winter and 47 degree days in the summer. When I planted them out, i put them in tyres full of wash sand, ontop of the clay and the pups are growing from the bottom of the tyres. I am about to pot the pups now.