Today I ground up the rest of my leaves (at least that I'm going to bother with), and harvested the last two of my kohlrabis, one of which got huge, and one not very big at all, in the same amount of time. These are 2 superschmelz kohlrabis, planted at the same time - 9-14 - and one got huge, the other was the smallest of all the kohlrabis I had. I've harvested the rest of them as needed, at normal size, in early November. That's a 4 qt bowl they are in, as reference.
Superschmelz kohlrabi, a 46.8 oz, and a 6.7 oz, harvested 12-5 by
pepperhead212, on Flickr