[aroid-l] Growing wall question


I am getting ready to extend my greenhouse and want to add growing walls on 
the sides.  I have installed these in my current greenhouse and they are filled 
with long fiber spaghnum (I ended up using about 8 bales of the stuff which 
was kind of expensive at 50 bucks a bale.  The walls in the extension will be 
both longer and taller so I am scared to even think about how much I may spend 
on that.  Is there a cheaper yet reliable substitute I can use for the new 
walls?  I know several people use coco-fiber.  Is this less expensive than 
Spaghnum and would it quickly degrade?  I have thought about buying large tree fern 
plaques in bulk and gluing them to the walls, everntually the plants will 
cover the seams, but is this a good idea?  I dont really like the idea of using 
tree fern products to begin with!  Any ideas on what i should use or should I 
bite the bullet and stick with spaghnum?
Thanks, Michael Mattlage



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