Hypertufa is a mixture of concrete, aggregates and organic ingredients used to make planting containers that simulate lightweight alpine limestone. There are many hypertufa recipes that call for peat moss as the primary organic ingredient. Some gardeners are shying away from the use of peat moss. Peat moss is composed of decaying vegetation that is found in peat bogs. Some environmentalists claim the moss is not a sustainable product because the harvesting process damages the bogs. If you do not wish to use peat in hypertufa projects, you can substitute other organic materials.
Combine 2 parts cement, 1 1/2 parts perlite and 2 parts coir fiber in a plastic bucket. Coir fiber is the fiber leftover from coconut husks when coconuts are harvested. It behaves similarly to peat moss and is used in many areas as a peat moss substitute, according to Washington State University Extension.
Add water to the bucket slowly. Mix as you add the water with the hypertufa mixture until the mix resembles cookie dough.
Turn a flowerpot upside down on a work space and cover it with a dry-cleaning bag.
Layer the hypertufa over the bag. The hypertufa will take on the size and shape of the flower pot.
Coat a dowel rod in cooking oil and press it into the hypertufa mixture to create a drainage hole. The oiled wooden dowel rod will pull out of the hardened hypertufa mixture easily.
Soak the flower pot with a spray bottle and cover with the remains of the dry cleaning bag. Allow the container to cure and harden for 24 to 48 hours.
Gently remove the dowel rod and pull the hypertufa container off of the flower pot. Brush the container with a wire bristled brush to soften rough edges. The container will be soft at this point, and can be carved if you desire it.
Set the pot aside and allow it to cure and harden for another seven days before planting anything inside.