drdawg said:Nothing is worse than pure, unadulterated clay! 
It is like the old joke about how to cook a loon. Step five of a protracted process was "then simmer it in a pot for 3 days, with a brick". The last step was to throw the loon away and eat the brick.
Maybe an ideal recipe would use pure clay as 15% of a mix:
1 part clay (25% of the mineral fraction, 15% overall)
1 part silt
2 parts sand
3 parts compost
Almost complete replacement.
At least I know some ways to manage clay. I wouldn't know where to start with pure sand.
