I know what it is and when i spotted it growing in one of my pepper plant containers i decided to let it grow there. i know it competes for water and nutrients with the pepper plants but i have not seen anything bad happen to the peppers. not long after finding it in the first pot it popped up in several other pots and this and the peppers have been co-existing just fine. these containers stay outside all year long and somehow seeds got into my potting soil. do you know what it is?