environmentally friendly roundup

by Marc Bethke
(London ON. Canada)

What can I use to control weeds on my interlocking brick patio. I used to use roundup. Is there a alternitive to prevent weeds from growing in the cracks , it is very hard to remove them by hand
Thanks Marc.

Doug says to use one of the environmentally friendly herbicides now available at your local garden shop. Some are soap-based, some are citrus based but all "burn" the foliage. It will require repeated sprayings to weaken the plant so the roots will die.