Lol where are you located. It's funny cause I grow brugmansia and I had a huge agave like that also. but no greenhouse out back
I grow many different things so if you are close and ever looking for something or need help with anything let me know. The basjoo you should plant in the ground in a area that doesn't collect water. I have had my mat in the ground for 3 years and are easy to overwinter with some mulch,straw and a tarp. I even did one out front with no protection. The mother died down but 2 new ones came up. That was with nothing not even mulch around them.
Here is my patch. Not great picture but it is from last week.
