Posted: 04/04/2013 at 07:54
Sorry to say it, Mizzli, but the plants are still going to be fighting each other for survival in that small pot. By my count, you've got 14 or 15 plants in there.
I appreciate your lack of space but I'd suggest a wider, shallower pot, something like this one that I'm using for some spare strawbs:
It's 40cmx15cm and much more suitable for a small crop of rocket because the plants will have the room to grow. You can get smaller versions - 30cm diameter - which would also be suitable.