I never really thought about making hypertufa stones in quantity for a rock garden. (Thanks for putting that in my head, Trond.)
-- What issues would one need to be cognizant of while embarking on such an endeavor? -- Since hypertufa contains lime that leaches into surroundings, would a weathering period be wise before use? -- Any adjustments in the mix? -- Would the hypertufa decompose faster or slower than above ground as troughs? -- Any experiences from you all out there?