Tie one end of twine loosely to the trunk, then wrap it vertically around the ball. Tilt the tree gently so that each loop passes under the ball's bottom. Never wrap twine all the way around the trunk. When you're done, the twine should be evenly spaced and no more than 6 inches apart at the ball’s widest spot.
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Burlap (42x42 inches for 18-inch-diameter root ball)