Don’t stress. Mold on your growing medium is usually harmless fungus, but it could mean your plant is getting too much water and/or poor air circulation. Here are our easy fixes: Move your plant so it gets more air. This will promote strong growth and discourage mold. For watering, keep the growing medium moist, but not soggy. Even when seedlings are new, they don’t need deep watering. Just use a spray bottle to mist the soil and remaining seeds. Keep the temperature consistent, too, so everything stays nice and constant.