Slowly add warm water to the wheelbarrow. Start with about 3 gallons and mix it well with the dry materials. You should end up with a consistency like cookie dough or a graham cracker crust. It should be wet enough to adhere so it doesn't crumble, but not too wet to ooze water. It should be wet enough to hold together when compressed, but not oozing water.
Step 7: Form the Trough
Set the mold on the plywood board. Begin packing the bottom with the hypertufa mixture, using your previously marked line as a stopping point. Working a small area at a time, use your hands to firmly press the mixture into the bottom corners and up the sides, making sure to mash one section into another for seamless adhesion for a strong trough. Continue up the sides until the sides are covered by a 2-inch-thick layer. Spray water as needed to keep the mixture moist while you are working.
Test Garden Tip: The plywood board serves as the bottom of the mold and makes transporting the trough easier.
Step 8: Add Drainage Holes
To provide proper drainage, use a dowel to poke holes in the bottom of the trough. Insert the dowel through the hypertufa until it meets the plywood base. Repeat to make six evenly spaced holes. Leave the trough to dry in protected spot.
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