Sweet Potato Vine? I am trying to start a sweet potato Vine?

I am using the toothpick method in water. It has been approx. 3 weeks now and the only thing growing is some kind of furry fungus on the bottom of the sweet potato. Am I doing something wrong?

Sweet Potato Vine? I am trying to start a sweet potato Vine?
I think you should start over. If you put the sweet potato in a dry and cool area, in about 7-10 days it should have some sprout coming out. No need for water yet. After the shoot comes out, you can cut the whole potato up and grow them in top soil or garden.