Stephen loves to garden and wants to grow lots of pink flowers for his pal Sandy. He bought a special Flower Power fertilizer to see if it will help his plants produce more flowers. He plants three plants of the same size in separate containers with the same amount and type of potting soil. He places one plant in a sunny window and waters it every day with fertilized water. He places the second plant in a more shady window and waters it every other day with fertilized water. He places the third plant in a dark closet and waters it every day with plain water. What did Stephen do wrong in this experiment