I had hundreds of iris, my husband sprayed weed killer and very few of the iris came up. Did the weed killer kill all my iris? Or is there any chance of them coming back?
Certified GKH Gardening Expert
I would investigate the type of weed killer used.
Most herbicides will kill perennials and it sounds like that is the case in your Iris bed.
You can wait and see and salvage any Iris that do survive.