Jay

Jim, thanks for the input. I guess I would be well served to use these pots for Tropicals or for trees wintered in my unheated garage.
If I am correct, the clay is the same but the temp of the kiln is what makes the pots 'harder'. If I was to convince the center to fire once at cone 9 or 10, would it be good enough for the first fire, or do both the initial fire and the glaze fire have to be at cone 10 to get the hardness required??

__________________
A Bonsai student living with his trees at N 44.37 W 77.49...
Think before you act... then think again... no good comes from rushing