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Fake Boulders- how to make rocks Faux boulders: paperback wire lath...bend it beat it to shape, then plaster it with trinity white cement with the stain of your choice mixed in; or: boxes covered with garbage bags, then covered with chicken wire, then covered with about 3 inches of pigmented hypertufa (portland cement, sand, peat moss mix). Gardenweb has a hupertufa forum that is interesting.
Hypertufa: Odd word for a lovely pot. Handmade hypertufa pots are easier to make than you'd think. Almost anyone can make them at home with just four ingredients -- Portland cement, perlite, water and either peat moss or potting soil. You don't need a pottery wheel, and you don't need a firing oven.