Absolutely. As explained in our WEED CONTROL ARTICLE, one of the great features of SURFLAN is that it won't hurt anything already growing. Use it at least twice a year to keep any weeds from growing locally in both your grass and flower beds.

Here are direct links to the information and products listed above:

Weed Control using Surflan:  http://www.lawn-weeds.com/weed-control#ground

Surflan:  http://www.bugspraycart.com/yard/pre-emerge/surflan-pre-emergent

What do you recomend without killing my irises??

Take some time to review the information we have in our WEED CONTROL ARTICLE. There is a section just one WEEDS IN FLOWER BEDS which offers up some options. You don't mention which type of weeds you have so I'm thinking either GRASS KILLER or the BASAGRAN will be needed; maybe both.

Direct links to this information and products are here including labels on both products:

http://www.lawn-weeds.com/weed-control#flower

http://www.lawn-weeds.com/weed-control

http://www.bugspray.com/catalog/products/page2004.html

http://www.bugspray.com/catalog/products/page2003.html

Labels:

http://www.bugspray.net/labels/poast_grass_killer_label.pdf

http://www.bugspray.net/labels/basagran_label.pdf