I live near Boston and have the blackest of thumbs, but a friend plants vegetables every spring. Last week I bought a huge purple radish, weighing over a pound, at H-Mart, a Korean supermarket.
It is shaped like a fat sausage and though the top had been cut off, new green was sprouting. I sliced the top off about a half inch from the green end and have stuck toothpicks in it to position it so the cut end is immersed in a container of water, a la the potato experiment every school kid tries. I also put one of my multivitamins into the water. The greens have tripled in size in the 4 days since, but no root formation has occurred. Will it? I was hoping my friend could plant it and grow his own purple monster.