Hello all, I'm no gardener nor will I pretend to be one. I'm a SUPER newbie and I have a super newbie question. I'm doing a science fair project with my son and he is trying to see what kind of water will facilitate the growth of a little bean seed. The 4 waters we used are salt, tap, spring and distilled. His hypothesis is that the distilled water, being the most free of impurities, will facilitate the most growth. The bean in the distilled water cup is coming along nicely, however, after two weeks, the bean in the tap water has exploded in growth and the stem and leaves are now poking out of the top of the cup.
What about the tap water lead to something like this?