Great information here. I'm a novice gardener who knows just enough to be dangerous
I had a sweet potato (Red Garnet) sprout in my kitchen, just hanging in a basket. When I realized how much foliage it had on it, I cut it into 3 big chunks and put it into a shallow dish of water just to see what would happen. After several weeks, it was beginning to take over my kitchen, vining all over the place. I think it was early June. I had to do something with it, so I took a chance and planted it in an empty raised garden box full of really nice sandy loam. The next morning, I thought it was going to croak because it was all wilted like and laying down on the grown instead of perky & upright. I gave it a big more water, and basically just crossed my fingers. Must have been a mild case of transplant shock because the next morning, it was fine!
It's now HUGE, with vines trailing every which way -- about 5 feet in diameter -- and it is BLOOMING! (The flowers are really pretty.) About a month ago, I went around and lifted the longer vines away from the soil, supposedly to encourage tuber formation beneath the main plant.
I live in NW Oregon (Hardiness Zone 8a). Our spring was unusually prolonged, cool and wet, but we FINALLY got some hot weather starting about a week ago. However, even the cooler weather has seen the vine grow lush and big. Is the hot weather necessary for the plant to produce tubers of any size? We probably have 2 months before we get first frost here. What are the chances that I'll actually get usable tubers?