It can be easily done if you've got the place to do it, and some really, really good holes dug with some good soil. You need a large root system to get an 1bl per plant, and the right strain.
Main thing is you better have a large root ball, good soil, and the right strain(s) and get a good start.
Ive got a buddy that been growing outside, in an outlaw state for over 40 years, and he always gets at least 30lbs a year, but many plants are only 1/4lb, and he cant dig huge holes, nor use nice big starts.
Id use at least a 3 x 3 x 18 inches deep hole. And that's a lot of work if your digging 150 of them. Especially where I live with lots of rocks, and roots.