I’m going to try module sown radish this year at four seeds per station. Is there a recommended spacing ‘on the square’ when it comes to planting these clumps out? 10 – 12″ seems a bit excessive considering the size of the roots.
Yes closer is goo, say 8″ (20cm), and by the time they are ready to go out, if it is not too cold, I sometimes sow early carrots first in 9″ rows, with the radish in lines between them, and fleece over the top.
I used two seeds per1 inch module and just placed the modules in the soil completely adjacent to each other across a 1.5m no-dig bed last year. They all grew perfectly and to a very even size.