Instructables

Step 8: Build a Greenhouse: Step 8 Dig a Trench

Around the perimeter of the garden dig up the grass so that it does not encroach on the garden. I filled the trench with blue stone. Then we dug another small narrow trench so that we could put the wires that connect the sensors to the birdhouse underground. We needed to do that because when my dad mows the lawn any loose wire can be easily caught. We put the wires through PVC pipe to protect them from any sort of natural damage (insects, water, etc). We then buried the PVC pipe in the ground from the deck to the greenhouse (about a yard total). 
 
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