Each year I save the very best sweet Potatoes to plant for the following season for growing out sweet potato slips. I have found that by utilizing my clay ollas using my EasiOyYa setup (https://www.indiegogo.com/projects/easioyya#/comments), I am able to provide a steady source of moisture for my sweet potatoes. All I do is set the sweet potatoes in the ground lengthwise near each olla, then I