Invasive plants in irises

I did not realize that Black-Eyed Susans would be so invasive when I planted them. Now they are coming up all over my perenial garden. I am most concerned about the ones entwined in my Bearded Irises because I can not get underneath them to dig them out. (I have a similar problem with onion grass in irises). Is there any remedy besides waiting until the season is over to lift the irises, split and replant?

Submitted by beejstevenson

Hi, Well other than pulling these plants out by hand, I don't think you have a lot of options. I suggest you do what you say and wait till fall, dig up your iris (which could probably benefit anyway from a dividing) and replant with fresh soil. If you have weeds that continue to come up from seed you could use PREEN in the spring to keep those new weeds from sprouting. It's a pre-emergent herbicide that will prevent weed seeds from sprouting.

Answered by doug.jimerson