Radish Sprouts

What happens when radish seeds are planted in the dark?  Will they grow?  We tested this hypothesis out and discovered that they DO grow in the dark.  However, they look different.  Our radish seeds in the dark were light yellow in color.  Our radish seeds in the sunlight were a dark green.  It looks like radishes can grow in the dark, but they do not grow well.  We learned that the sunlight is important, and necessary for healthy plants.