There are different grades of geotextile fabrics...the grade found at
homeowner supply stores is usually inferiour to what you can order from
a landscape supply outfit...talk to local contractors. Also, some
perennial weeds (not sure about wild onions) are persistent enough to
eventually work through any fabric and should first be treated with an
appropriate herbicide. Good luck.
--
Dan Eskelson
Clearwater Landscapes, Inc.
Landscape Design Online
http://clearwaterlandscapes.com
mailto:d...@clearwaterlandscapes.com