Posted: 12/05/2015 at 07:45
Spring onions will take a lot longer than the others, three or four months, so resowing probably isn't on.
The radish would be the quickest of them to crop so they should be the priority for resowing. You can resow radishes in the same spot, I do it all the time. And, given their size, you can sow them in any available space between the greens.
The rocket should be "cut and come again", regenerating itself, so you shouldn't need to resow providing you don't over-harvest.