How to Grow Sweet Potato Slips in Garden Soil Sweet potatoes require a long, warm growing season of 85 to 120 days from planting out to harvest. Starting slips directly in the garden takes four to ...

Growing Potato Slips With Water: Place a sweet potato in water with the root side down. (Use toothpicks so it doesn’t keep floating to the top of the jar.) At least half of it must be covered.