Thanks.

Do you think I could sow them.

Then let them go to seed. Or even pick a few greens.

They are old seeds.

If you have the room, I would plant them. Even if you do not get good tasting radishes, the seed pods are edible and can be used in salads, etc... They can be a bit hot/peppery depending on the variety and how big you let the seed pods get and saving radish seeds seems relatively easy.

I think you could and might as well sow them. If they're old seed there's no need to hang on to them. If you sow them near your squash plants and let them flower, they'll attract beneficial insects that may help control squash pests. I always sow rat-tail radishes for their seed pods and flowers, and they grow intermixed with my squash plants all summer long. As long as you aren't expecting radishes you can eat, you're good to go. It is pretty hot down here---90 degrees yesterday, so I wouldn't attempt to grow/eat radish bulbs in this sort of heat, but for pods, flowers or seeds, there's no reason not to grow them this late.

They are a bust. I did a germination test. Not one sprouted.
The seeds were from 2011.

I read this thread the day after I planted a 20' row of old seed. I mixed 6 random packages together & through caution to the wind. I now have a pretty full row of radishes! And still half the seed left! They're all Cherry Bells. Could I use the seeds? They'll be in a separate but adjacent bed to squash...is that close enough? Uh-oh....by the maters. Am I asking for trouble?

plantermunn, Sorry you got zero germination. Oh well, nothing ventured, nothing gained.

Paula, I think that the adjacent bed is fine. The radishes attract lots of tiny beneficial insects when they bloom, and those beneficial insects really help all plants. I don't believe they'll bother the tomato plants at all.

Dawn

The only disadvantage is they attract the white butterfly, who's larva are cabbage worms. At least they did in my yard. This might not bother Paula. ;) It didn't stop me from growing them, but the butterfly seemed especially fond of radish flowers. I never paid attention to whether or not the cabbage worms were on the radishes, because I wasn't eating them. Supposedly planting icicle radishes in a ring around your squash plant deters squash pests. It didn't help for me, but as Dawn says, a lot of beneficials are attracted to the flowers. I also had radish volunteers until the chickens cleaned the beds.