Using your hot glue gun, add a small dot of glue to the top of an orange pom-pom.
Firmly press a small green pom-pom on top of the glue and hold down for about 3 seconds. Repeat steps and 2 to make all the pumpkins.
Then, thread a needle with the invisible thread, making sure to pull a long piece through the needle. Leave the other end of the thread attached to the spool. Run the needle through the base of each of the green pompoms to string them all together.