If I were going to try it, I would do it earlier rather than later. I think your chances of success would be better since radishes mature so quickly. If you disrupt them after the roots put down I doubt you will get anything. And of course while you are running this experiment, I hope you are replanting with fresh seed. Because you need to plant every two weeks all spring to keep a succession crop coming on.

You probably could successfully transplant if you do it ASAP, since the plants are only a few days old and only have their seed leaves. Generally, after the radish plants sprout, they should be thinned to the proper spacing before they get more they 3 or 4 true leaves, and yours are nowhere near that point yet, so the odds are in your favor. Transplanting can work with very small, young radish plants but not necessarily with larger ones.

The most common reason that people have a radish failure and don't get actual radishes (a phenomenon commonly referred to by saying the radish plants "didn't radish up") is because they wait too long to thin the radishes. In order to get good radishes that radish up properly, they need to be thinned to the proper spacing very early in their young lives. If you have a radish variety that has a DTM of 3 to 4 weeks, you can see why you must thin while they are still small and young. If you wait too long, they already have somehow perceived that they are too crowded to radish up and often will fail to give you anything that resembles a radish. Since yours are so small and haven't made true leaves, I feel like the ones left in the ground should radish up after being thinned. Whether the ones you transplant will radish up is open to debate, but why not try it just to see what happens? That's how you learn what works---by treating it like a scientific experiment and learning what works under given circumstances and what doesn't work.

You can succession sow more seed weekly through April in order to give you a continual weekly harvest of radishes, so it certainly is not too late to just sow more seed.

I generally don't even have to thin my radishes because I simply plant the seeds one inch apart from one another, eliminating the need to thin. That's what I call "lazy gardening" and it works for me.

Of course, you have no control over what the rain does to your seeds, but the next time that rain threatens after you've sown seed that hasn't yet sprouted, if you'll lay cardboard over the seeded area and put a couple of bricks or rocks on top of the cardboard in order to hold it in place, the cardboard itself likely will prevent your seeds from washing out. Just be sure to remember to remove the cardboard after the rain ends, or the plants can try to sprout beneath it and then die when they can't get up through the cardboard in order to get light. This also is a great technique to protect tiny carrot seeds between the time you sow them and the time they sprout. Just check underneath the cardboard daily and remove the cardboard as soon as you see the first sprout.

Great advice from both mulberryknob and Dawn! The plan is succession planting but that always breaks down for me somewhere part-way in. This was just the first little row of radishes but somehow they are not a row any more - just a clump! I'm blaming the rain but who knows - maybe I just dumped a pile 'o seeds somewhere I didn't mean to! Dawn - I like the cardboard idea and will try that in the future. I sorta, kinda, square-foot garden so I usually just plant a certain number of seeds per area and don't overseed/thin. Mostly. I'm trying things out! :) Thanks guys!

Kate, You're welcome.

You've learned the first rule of gardening in Oklahoma: always blame the weather when things go wrong. Otherwise blame the gophers, moles, voles, deer, rabbits, possums, skunks, flea beetles, aphids and grasshoppers. That way, nothing is ever your fault. (grin)

The nice thing about radishes is that they are so quick to produce a crop that you can just keep succession planting and have them for weeks on end. Even if one week's seeds fail to produce, other succession plantings will be coming along and providing radishes before too much more time has passed.

It is your garden, your rules, and if no one saw you dump a pile 'o seeds all together in one spot, then it didn't happen, right? No one can prove it happened so you don't even have to confess to having done it. Just like Las Vegas, what happens in the garden, stays in the garden.

Dawn