rv

Tommy,
There is a product made for containing running bamboo called "rhizome barrier".
If I were looking to contain the bananas it is what I would use.
I just don't want my tortoises to eat the pups and chew the P-stems and topple my large plants so I need to elevate the planting surface high enough to keep them out.

Blownz, I added a pic to my gallery so you can see what they look like.
Mine are Sulcatas, the largest mainland tortoises, the really giant ones are island species coming from the Galapagos or Seychelles.

Okay Marvin, so if I build the beds and leave the bottoms open like I plan to the roots will have plenty of room to meander and the foliage will be protected from the perpetrating terrapins.

Maybe I'll go a bit larger than 5' x 3', it seems like a box that size could contain 5 or 6 mature plants?

Thanks everyone

Ray