Hypertufa

Tufa is a porous rock often found near mineral springs. It is a naturally occurring limestone rock. Hypertufa is a similarly lightweight and porous rock but it is made as a substitute for tufa which is created by a very slow process. Hypertufa can be made with a variety of mediums mixed together and bonded with Portland cement. The wet mix can also be formed into a number of different shapes including garden containers

Hypertufa is favorable to concrete and terracotta because it is more porous and lighter weight. Air flow to the root system promotes plant growth. Hypertufa can also be subjected to temperatures well below zero degrees Fahrenheit without damage. To top it off, the materials to make hypertufa are inexpensive and easy to find. Here are the steps to get your hypertufa collection started.

Decide what mold you will use first by determining what hypertufa creation you want to make. Birdbath, planter trough and single plant container are all good options for a beginner. A disposable plastic container works well as a mold because it can later be discarded and is easier to remove from the mix. If using a bowl as a mold that will later be used for food you can line it with a plastic bag to keep the mix from damaging the container and make it easier to separate the mold from the dried hypertufa.

In a bucket, mix equal parts of Portland cement, sphagnum peat moss and sand. The quantities will depend on how big your project is. Gradually add water and stir until the mix is the consistency of peanut butter.

Line the inside of the mold with the hypertufa mix pressing firmly against the mold so it will hold together and maintain the correct shape. Use your hands to smooth the edges of the hypertufa and remove any cracks while also pressing out any air bubbles. If you are making a planter and want to allow drainage now is the time to poke holes through the bottom of your container.

Set the hypertufa project in a protected, shaded area to dry slowly over the next few days. Cover it with plastic so it will not dry too quickly and crack. In a few days the mix should be dry enough to remove the mold. The finished product will have a rustic appearance. You can rough up the sides that are smooth from the mold by scraping them with a file or rock, or you can leave it smooth for a contrasting texture.

This project lends to unlimited options of gardening creativity. Enhance this project by adding color dyes to the hypertufa mix or painting the finished projects. You may also consider trying another hypertufa project such as making garden homes for gnomes and fairies or stepping stones. Get the kids involved and see where their imaginations lead.