buy a pack of tampons. the ultra flow hover dam stopper ones, should go without saying but remove all the plastic. carefully remove as much of the top layer of soil as you can...basically bury them as deep as you can without harming your girls. Bury 5 or 6 of them, more the better really, it's just tightly wrapped cotton. replace the soil you took out, cover the tampons and water. Laugh if you want, but it works. But if watering twice a day is no problem for you and you can tend to them that often, then just stick with that.