Cut the fabric off the umbrella top, leaving the ribs intact. Discard the fabric. Adjust the ribs so they point in the direction you want.
Measure the length and width of the umbrella pole.
Dig a hole in the soil where you want the trellis to go. Make sure the spot gets the appropriate amount of sunlight for whatever plant you want to grow on the trellis. Use a post hole digger, and make the hole three times the width of the pole. Divide the pole's height by 3, and make the hole that deep. For example, if the pole is 6 feet tall, make the hole 2 feet deep.
Lower the umbrella into the hole. Fill the hole with no-mix concrete until it is 3 to 4 inches below the ground level. Add water until the concrete is saturated. Let it dry for four hours before planting next to the trellis.