For the pumpkins, you can cut the top off just like a jack-o-lantern, save the tops. With the squash try laying them on their side to be sure they will sit firmly and not tip over, then cut a hole in the top so the squash, keep the lid.
Scoop out all the pumpkin and squash seeds, and save in a bowl. These make fantastic Roasted Pumpkin Seeds which are a perfect snack or on a salad. You can wash and freeze extra seeds in zip-top bags for roasting later.
Save the tops of the pumpkins, and you can add these to the arrangements.
Push a small piece of the skewer into the pumpkin and squash tops and push down into the centerpiece to secure, this looks so cute!
Once the oasis is soaked, use a knife to slice it into pieces to fit into the pumpkin as you go. Place down into the pumpkins and squash.
Cut the flower stems shorter and push them down into the oasis one by one. Keep trimming until they look nice and not too tall. Try to use leaves to cover fill in the area so the green oasis is hidden.
Have fun using different materials, you can even use your own garden clippings, flowers, and greenery. I like to use bright Fall colors, yellow-orange roses, daisies, sunflowers, eucalyptus, and greenery like lemon leaves.