Spent a half hour adding some compost to my german butterball potatoes now that they are 6 inches tall. Ended leaving only the top few inches of the plants above the surface.
This is actually the second mounding since they first sprouted: i planted them in a 4″ deep trench and when they were 6″ tall, i filled in the tranches, again leaving a few inches above the mulch.
Why? There are a few reasons…If potatoes get exposed to sunlight, they turn green and become inedible: actually, potentially toxic! It also increases the yield a bit since the now covered stems will form tubers. Heavy mulching helps with moisture retention and keeps them evenly wet, and don’t forget about mulch’s role in keeping weeds down.