radishes? am I really dim?!

[nubbins]

So, do you just get 1 radish per seed or several like with potatoes?

1
but they self-seed easily so let a few go to seed and you will get some next year without even having to bother to plant them!

One per seed. If you sow thickly then thin out (pick out little plants from the soil so there is more room around them) otherwise you'll get v small radishes.
Good luck.

thanks!