Forgive me if this has been discussed before, but I did not see it on my search through this forum.

I had purchased a pre-owned home over a year ago. The previous homeowner planted a myriad of African irises. When I first saw them and mentioned removing them from my front yard, the real estate agent advised me to leave them alone as they are extremely expensive and would bloom well. I live in Houston, Texas.

Many months later, they did bloom most abundantly, but once the season was over, all I have left are a bunch of green-yellow and dead brown tall "weeds." Should I just trim the entire bunch down to the ground? I read that advice in a gardening magazine, but I have seen contradictory advice on the internet.

Thank you.