Place the berries in a saucepan and add the spinach on top of the berries. Cover with a lid and cook over medium low heat for 15 minutes. Stir occasionally to combine the spinach in with the berries.
Use a blender to combine the berries and spinach into a puree.
Place parchment paper on each dehydrator tray.
Pour 1 cup of the heated mixture onto each tray. Spread the mixture out to 1/8 in thickness.
Dehydrate at 145 degrees for 4-6 hours. You will want to check the fruit leather frequently after 4 hours. The leather is done when it is dry to the touch and easily pulls away from the parchment paper.
Allow the fruit leather to cool completely.
Once it is cool, leave the fruit leather on the parchment paper. Use kitchen scissors to cut the fruit leather and paper into strips that are about 12 inches in length. Then simply roll up with the paper on the outside and store in an airtight container.