A Radish Grower I Am Not!

For some reasom I can not successfully grow radishes. Last year all I got were roots.
 This year they seemed to grow so slow that I left them in the ground a lot longer- well again some were just roots and some got very large tops- these did produce radishes- unedible radishes very woody an unpleasant tasting!
 But the rest of the garden is doing very well!
 I am thinking that there will be zuchini in a few weeks!