I planted 12 tubers last week.
Only about 3 inches deep. My soil is clay and when wet gets very heavy, so I wasn't sure if too deep they might struggle to sprout.
All of them in the last two days are sprouting.
I have read that you're not suppose to water them when you plant them but I did anyway.
I dug holes about 18 inches deep and back filled with about 6 inches of clay, filled in 6 inches of miracle grow garden soil, more clay that I "ground up" in a bucket with a drill and mixer.
Put the tuber on top of that then topped with more garden soil.
Then I watered each one for about 2 minutes and haven't watered them since.
A couple of them have 4 inch sprout already.
Until two days ago I had wondered if I had ruined them or not with watering them right away.
I can't wait to see them.