something real simple & natural , cheap too
i think its cornmeal
gluten 
they cannot grow where its spread
read it in mother earth last year
http://www.grinningplanet.com/2006/0...al-article.htm
what i do tho is to pop all the tops first
all the yellow flowers go in a bucket
cuz seeds are REAL soon to follow
then i take a regular shovel spade and slide
it in next to the biggest ones first,,,,
and semi lift it to loosen the soil a bit
so you can yank out the hole root
then ya step on the spot re seating the soil
of course if your inundated with them and striped bass
are about to explode on yer plug...soon
poison the crap out of them and go fishin