Herbicide

Difficult to provide a recommendation on selective herbicides that will kill weeds but not harm irises without identifying the weeds you need to control - you have close up photos of the weeds you can post?

For Bermuda grass...........MSMA. 2.5 gallons about $100 ordered from Amazon. Use often when getting Bermuda established.

I get what you are trying to do but if you are dealing Vasey grass, perennial, and a sedges I’m not sure what post-emergent herbicide you could use without harming the LA irises. You can use just about any of pre-emergent herbicide without issues to the irises but that’s not going to help with perennial weeds like Vasey grass and certain sedges.

Im going to recommend you contact either one or both of these people with the LSU AgCenter Dr. Chris Mudge (cmudge@agcenter.LSU.edu) and Dr. Ron Strahan (rstrahan@agcenter.LSU.edu). Dr. Mudge is an aquatic plant/weed control specialist and Dr. Strahan is a turf/lawn weed specialist. I’d copy them both in the same email, and they are both in the same building on the LSU campus. Common for professional colleagues to walk down the hall to pick each other’s brains when trying come up with a solution to a “tricky” problem.

Attach photos of problem areas so they can see the irises and the weeds you are dealing with.

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Ed Osteen

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I think you can if you are careful and take great care to keep the trichlopyr off the azaleas and the crape myrtles. If they are larger, mature azaleas and crape myrtles getting a little trichlopyr on them shouldn’t be a problem.

But since I’ve never personally dealt with bushkiller vine I’d suggest you shoot an email to Dr. Strahan (contact in my post above) and ask him for his suggestion. I know he’s written articles/blurbs on bush killer vine and control recommendations/suggestions - I just don’t recall the details.

Thanks as well