!. Overwatering. My kids recently experienced this one. They get so excited for starting their seeds and want to take the best care of them. It’s kind of like smothering a pet, you love it so much it hurts the pet. Don’t do that with your seeds. Wait until the soil is beginning to feel almost dry to water. And I mean almost dry, not completely dry. There should still be a bit of moisture in the soil. Your little seedling babies will be ok, I promise.