This is a great juice to make in fall when most of the ingredients are in season in September and October. Grapes, apples, cucumbers, and kale are all easy to find in stores right now, and if you grow a garden you may even have some of your own homegrown produce. The cucumber plants in our garden have been huge producers this year, and we have been blessed with gorgeous dark green cukes that just keep coming. And our kale is thriving in the cooler days and nights of the Pacific Northwest and we expect to harvest it well into November.