None of the plants was useful.

I had bought the plant last late summer. Sorry, no longer came to a usable size. The biggest was 20 cm tall. From packaging ago I was very disappointed. All wrapped in newspaper and not very caring. It was a precautionary measure twice the amount of plants in the package but since 2/3 of the plants had broken through, was to use as little of anyway.
I would not recommend unfortunately.

Update 2015: I have one year abstinence again range dares ans Grünkohlplanzen and half bought seedlings at the weekly market and let the other half himself germinate in a greenhouse, at the weekly market plants the quality was much better, the plants their strength and resistance, in the own seedlings quality analogous to the purchased plants from 2 years ago. Overall appreciation on 3 stars because the quality of later viewing without the then frustration of missed harvest probably was "normal".