The Dark Side
Posted by Michelle on May 20, 2004
Q: Why do some seeds (like lima beans) grow quicker (and better)in the dark?
A: Good observation! Although it may appear that a given seed (plant) is growing better in the dark, it really isn't. Plants need light to make their own food and grow normally however when in a dark or very light-limited situation, the plant uses all of its energy into getting to the light. So, germinating (sprouting) seeds often grow quickly and extensively as they "search" for enough light in which to grow. If you've ever looked under a board in the spring you may have seen that seeds there have produced very pale, lengthy plant stems that were unable to reach the light and just sort of curled around. Once a light source is reached, a plant can then begin functioning in a normal fashion, making food and growing.
John Wiessinger ( May 23, 2004)