In my plant experiment we got four cups and put the same amount of dirt in each of them and put the same amount of seeds in each. Our experiment was to see if we could color grass using food coloring and coloring the water. We used the colors blue, green, yellow and our control was regular water. we found that the grass did not change color at all and in fact it slowed the grass growth down because in our control the grass was lush and really tall. In conclusion you cant use food coloring to color grass.