Those seedlings seem awfully tiny for being planted 2 months ago... Carol, what has the temp been like where you are? Most radishes are just about ready to eat in 2 months, and those have barely gotten started. Are they planted in the ground in the GH, or in a container? and if in a container, what sort of growing medium are you using? Did they germinate quickly and then just kind of stay that size? Radishes usually sprout quickly and grow quickly... (I've had larger sprouts than that in my salad seed sprouter within 2 weeks!)