Succulent pumpkins last for months when cuttings are just glued on. Tacky glue works well, although it’s not waterproof. The succulent cuttings don’t need water, so when it’s time, I just put them out in the rain, and they fall apart, so I can replant the cuttings and toss the pumpkin on the compost pile.
Start with an unblemished pumpkin. No pokes, scrapes, or soft spots that will lead to rotting. Wipe clean and circle with glue and add moss around the circle and press down. This provides a base that will help hold the succulent cuttings in place, and stop drips, while hiding the mess in the middle. It helps to let this dry for a few minutes before proceeding.
Spaced evenly, the layers of cuttings help support each other. If something slips, stick it back in (with glue if needed), and cup with both hands lightly and hold for a few seconds.
Let dry, occasionally cupping and pressing lightly to keep everything in place.