Agave in shallow, low-weight situation
I'm new here and am hoping I can get some ideas on a challenging situation.
I have a rooftop deck with a load bearing capacity of 200kg per square metre (around 440 pound per 1.2 square yards). I also have a corrugated iron container that is 1.2 meters (1.4 yards) in diamter and about 60cm (2ft) deep, and access to a bunch of semi mature agave.
I can't fill that container with soil or it will go through the roof.
So, any ideas on these challenges?
- How can I fill the container with light weight material (foam??) that will bring the container up to a depth that isn't structurally dangerous?
- How shallow can the soil be for agave? 30cm / 1ft? Technically I shouldn't do 'normal' soil more than 15cm deep.
- Is there a soil alternative that may provide more depth that would be suitable.
... is this a stupid idea?