i guess if you were scared of overwatering them you could sprinkle some around the soil. i dont think i would do this with a powdered fert. like miricle grow or something because i would be scared to burn them. i would do it if it was guano like i use without being worried that it would burn. otherwise just wait, i still think it would be rather hard to overwater outdoors since it should easily drain away unless you have bad clay soil.