Alpine Plants

How to Create a Hypertufa Trough: A Step-by-Step Guide

Materials:

• Portland cement
• Perlite
• Sifted peat moss
• Concrete reinforcing fibers
• Water
• Heavy-duty rubber gloves
• Dust mask
• Screen or sieve
• Stiff wire brush
• Mixing tub
• Large plastic bag
• Mold or form

Choosing a Mold

You can purchase molds specifically designed for hypertufa troughs, or you can create your own using plastic tubs, cardboard boxes, or other materials that will not stick to hypertufa. For curved sides, the thickness should be at least 2 inches.

Making the Hypertufa Mixture

1. Measure out the ingredients in the following proportions: 2 parts cement to 3 parts each of perlite and sifted peat moss.
2. Add a handful of reinforcing fibers.
3. Gradually add water while mixing the ingredients until the mixture holds together and barely drips.
4. Allow the mixture to sit for 5-10 minutes before using.

Forming the Trough

Using a Box Mold:

1. Line the larger box with plastic wrap or plastic bags.
2. Place the smaller box inside the larger box, centering it.
3. Pack the hypertufa mixture between the sides of the boxes.
4. Smooth off the top edge or create decorations as desired.

Using a Rounded Mold:

1. Place a layer of plastic wrap or a plastic bag over the mold.
2. Apply a 2-inch ring of hypertufa mixture around the base.
3. Gradually build up the mixture, covering the mold.

Curing the Hypertufa

Stage 1:

1. Place the molded hypertufa in a plastic bag in a sheltered spot out of direct sunlight.
2. Allow it to cure for 12-36 hours, or until it is firm to the touch.
3. Remove the hypertufa from the mold and use a wire brush to smooth any rough edges.

Stage 2:

1. Place the hypertufa back in a shady spot for another three weeks.
2. The hypertufa should become lighter in color and weigh less as the water evaporates.

Stage 3 (Leeching):

1. Fill the trough with water and let it drain slowly.
2. Repeat the process for 7-10 days to remove excess lime.
3. Alternatively, place the trough outdoors in a rainy area to facilitate leaching.

Planting in the Hypertufa Trough

After curing, your hypertufa trough is ready to be planted. It is particularly suitable for plants that prefer well-drained conditions, such as alpines and succulents.

Tips:

• To enhance drainage, drill small holes in the bottom of the trough after the final curing stage.
• Protect your hands by wearing heavy-duty gloves and a dust mask during the mixing and handling process.
• Work on a tarp or plastic sheet to minimize mess.
• Allow ample time for each curing stage to ensure the hypertufa cures properly and develops its strength.