Nipping out extra buds of potatoes is well-known technique in Japan. Too many buds or sprouts might suck up nutrition which should be distributed to potatoes and then we might end up with only smaller potatoes. Today I pulled out some of my potatoes' buds. The yellow-circled bud was smaller than others and it was the one to be nipped out.
I remember I was surprised with the fact that none of my blogging friends in overseas didn't know the technique when I introduced the technique last year on my blog.