I've read a lot of posts regarding the best spacing for radish and how you shouldnÃ¢â‚¬â„¢t plant them too close together or it will stunt bulb growth etc.
I have to call BS on this however.
Recently I wanted to plant a few radishes to try a new pickles recipe I came across but didn't have any spare containers, so I decided to plant some around some tomato seeds in a container. The recipe called for 20 radishes so I decided to plant 2 seeds in each of 12 holes in an area the equivalent of 60cm x 5 cm around the edge of the container and well the results speak for themselves:
Lots of good growth and healthy looking leaves:
No problems at all with adjacent bulb growth:
A massive harvest from an area of 60x 5cm in just 5 weeks:
Give it a try