Name: Sandy B. Ford River Twp, Michigan UP (Zone 4b) (Zone 4b-maybe 5a)
Carol, you're right to assume that radishes normally aren't transplanted; I agree with the other suggestions that maybe the seeds were a bit too shallow, or not getting enough light, as the possible cause -- or maybe the stems of the varieties you planted are just red !
“Think occasionally of the suffering of which you spare yourself the sight." ~ Albert Schweitzer C/F temp conversion