I m looking for low maintenance iris growing ideas

Can anyone come up with another idea for iris growing please.I have for a long time grown bearded iris in a separate bed . It's hard to weed out at times .like now it's full of grass even though it was all done September'.
It's been suggested that I gravel then grow in troughs. I'm not sure this would work though
Are there anymore ideas out there please?
Thank you in advance for any low maintenance ideas
It's been suggested that I gravel then grow in troughs. I'm not sure this would work though
Are there anymore ideas out there please?
Thank you in advance for any low maintenance ideas
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