Sweet potatoes usually have around 100 or more days to maturity. I like to let them go a little bit longer and keep them in the ground until the first frost or two. This gives them even more time to grow large. If possible, dig up the sweet potatoes when it has not rained for three days. This will help to promote less dirt or mud to stick to the potatoes. Here's how to harvest them: - Cut away all the green ivy growth so you can see the individual planting areas. - Use a potato/garden fork or sh