[Cob] no need for plaster

[Damon Howell]

There are a few places on my wall where I smacked it with a 2x4 while  
it was barely pliable and it becomes very resistant to erosion. No  
plaster, just cob. I suppose having some of the straw exposed might  
be a downside, but if there's no need to plaster why do it? Didn't  
some of the cob building in England last centuries unplastered?
Damon