Do magnets pull a growing plant off course? You plant six radish seeds in each of three clay pots. Pot A has a magnet at the bottom beneath the soil. Pot B has a magnet on top of the soil. Pot C has no magnet. All three pots sit under the same grow light on the same watering schedule. Once the seedlings reach eight centimeters you measure how far each stem leans from vertical. The stems in pots A and B bend toward the magnet. The stems in pot C grow in random directions. The magnets affect stem direction but not root growth.