Make a Hypertufa Trough - Part 2

Step 2: Prepare the Mold

Using the serrated knife, cut insulation into two 16x6-inch pieces and two 18x6-inch pieces. Assemble these four sections into a square or rectangle, depending on how you join the ends. Insert two nails through the insulation material -- one near the top and one near the bottom -- of each intersection.

Test Garden Tip: For a rectangle, assemble as shown with the 16-inch section outside the 18-inch section. For a square, assemble with the 16-inch section inside the 18-inch section.

Step 3: Secure the Mold

Wrap tape two times around the mold, once near the top and once near the bottom, for added reinforcement.

Test Garden Tip: Almost any type of tape will work: duct tape, masking tape, or painter's tape.

Step 4: Mark a Thickness Line

Mark a line at least 2 inches from the bottom as a guide to the depth of the hypertufa; this will mark the thickness of the bottom of your trough. Note: If you create a larger container, you'll want a deeper layer of hypertufa to give your trough more support.

Step 5: Mix the Dry Materials

Put on your gloves and measure 2 gallons cement, 2 gallons perlite, and 4 gallons peat moss. The amount will allow for some left over material to make trough feet. Mix the dry ingredients in your wheelbarrow with the hoe.

Test Garden Tip: Add 1/3 cup of reinforced concrete fibers to give your hypertufa trough more strength. Find them at building supply stores.

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