Hello, I am not a gardener at all, I love plants and flowers but have no knowledge apart from water and feed. We have recently moved to a rural cottage and there was a lot of bindweed, even down a drain,.which we cut back and weed killed. These root like things have appeared, I googled and it came back with a yellow iris. Is this correct and is this another invasive thing?. We also had a vast amount of mares tail which was weed killed. I just wanted a lovely cottage garden, it looks like I've inherited all the invasive beasts that won't be killed 😂 help. X