Fortunately, this is one of the easiest sins to avoid or correct. As with all things, preparation is the best method. For soil growers, that means starting with a good soil mixture that allows for both drainage and retention of water. In my experience, the easiest soil mixture is 50% Peat Moss/Coco Coir and 50% Vermiculite. Straight Coco coir is a popular option also. For Deep Water Culture growers, using a good air pump and multiple airstones is the way to go. We suggest MULTIPLE AIRSTONES, because they can become clogged.
Don’t forget to clean and disinfect your airstones at the end of each grow.
How to know if you’ve overwatered:
Soil: Use the ‘1 Knuckle’ method. Stick a finger down to your first knuckle. If it feels dry, it’s probably time for a drink. With potted soil plants you can tell by the weight. Lift the plant, if it feels light, water.
Beginners, don’t worry, you’ll learn how your plants should feel over time.
Seedlings are easy to over water, so go easy with the amount of water until they get 2 sets of leaves.
Coco Coir: You will need to water every 1-2 days. Don’t let coco coir dry out but you don’t want it soggy either. The weight method works well with coco coir.