[Cob] question

[Alhana Tierra-Sky]

Hey everyone! I have a question . . .
a couple of my friends are wanting to build cob flower bed walls and they 
want to know the feasability of it. Is it workable, or will the water and 
moisture from the flower beds seep into the cob and destroy it? If they 
plaster over it, will it help? I was thinking about telling them to build 
the lower part out of river rocks or rocks, and then to add onto the wall 
with cob. When people do build the foundation with river rocks, should they 
dig a small foundation or trench to place the rocks in and build up from 
there, or can they start the foundation from ground level? Also, what kind 
of mortar do you use in between the rocks? Cement? Or is there an earth 
based mortar that can be used?

I hope everyone is doing well . . .
BTW, I have been planning to apply to Cob Cottage Company for the intensive 
apprenticeship program this coming summer . . .  does anyone else know of 
any other start-to-finish apprenticeship programs that I might want to 
consider? Let me know . . . Danke!
Alhana

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