To prevent underwatering or overwatering weed, you should follow these tips: Use well-draining pots with drainage holes and a saucer to catch the runoff water. Use a well-aerated medium that retains moisture but does not get soggy, such as coco coir, perlite, vermiculite, or a mix of these. Use organic nutrients that are less likely to cause nutrient burn or lockout. Water your plants in a circular motion around the base of the stem, not directly on the stem or leaves. Water your plants slowly and evenly until you see runoff water. Wait until the medium is dry before watering again. Check the weight of your pots before and after watering to get a sense of how much water they need. Monitor the temperature and humidity of your grow room and adjust accordingly. Keep a watering schedule and record how much and how often you water your cannabis plants. By following these tips, you can avoid overwatering or underwatering your weed plants and ensure that they get the optimal amount of water they need to thrive.