25 days probably does work if the temperatures are perfect. Not too
cold and not too hot. In the real world, that just about never happens.
If the radishes are too close together, most of them never will
plump up to make a good radish. Something to consider.

Steve



James wrote:

I planted tons of seeds on 3/1. Sprouted after a week. So far I've
just had 6 undersized ones. It's been way over 25 days even from the
sprouts.

Has anyone harvested radish in about 25 days?