It has been years since I have grown sweet potatoes - but to the best of my recollection:
you can get several slips from one plant (slip is leaf and stem)
we used to “bed” a few sweet potatoes to make a lot of slips, however using a plant that you rooted in water should work
you just need one leaf sticking out of the ground and rapidly the plants will grow, filling in the area
you cannot really plow sweet potatoes because they grow very very horizontal (even moreso than peanuts) - whole other animal than irish potato -
generally the sweet potato tubers do not make deep in the ground but are rather shallow
I have never container grown sweet potatoes, my only experience is field grown
btw...I do not recall side dressing the sweet potatoes with anything nor having any pest problems..,they are a labor free crop until it is time to dig them
/johnny
Do you know whether they can tolerate the toxins from walnut trees? I have a space near some walnut trees that needs something to grow.