I am being inundated with Horse Nettles. I have 6.6 acres, 1 1/2 ac. sheep pasture, large organic garden etc. I know how difficult it is to get rid of horse nettles as they spread by seed, root pieces and leaves. In my pasture I hand sprayed each horse nettle plant with Monsanto (yuck) super Round-Up. They are back again this year with a vengeance. My whole organic garden is now full of them. What do I do? Please help me! Thanx everyone!