Our Purple Plum radishes (Raphanus sativus) were planted in the Michigan State University Teaching Greenhouse, and harvested four weeks later. Since this particular breed of radish plants are expected to germinate in seven to fourteen days and mature in twenty to fifty days, we felt that they would give us the opportunity to obtain the necessary results within a reasonable amount of time. We grew the radishes under four different watering conditions: rainwater, standard Michigan State University tap water, water collected from a cycled, stable, healthy home aquarium, and tap water treated with commercial Miracle-Gro ™.