Steps to digging a perfect garden trench
Start with laying a garden hose on the ground to define the shape of the new planting area.  The hose will give you a guideline to follow.  You will need to use a sharp digging shovel to dig a v-type trench. 
Select a sharp flat shovel to cut the trench.
Hold your spade at about 45 degrees, with its sharpened head on the edge line. Put your foot on the head and guide it at a 45-degree angle 3 inches into the soil.
Lift out the grass and soil and toss it into your wheelbarrow. Take a step to one side and make another cut and toss to match the first. Continue down the line you’ve drawn until the entire edge is dug out.
The trench should be 3 inches deep, sloping up to 3 inches wide at the top. Let the lawn grow right up to one side, with the garden bed meeting the other side.
 
 
 

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