"Weeding" is taking away the negative spaces, the pieces you don't want in your final image. These shapes can be stuck to a backing (plastic, wood, paper, etc) to create new patterns...or balled up and thrown away!
The positive of the image remains on the backing, ready to be covered with transfer tape and transferred to the final destination.
We stuck the image onto some painter's plastic and used the ultrasonic welder to make a pillow.
