Hi, I'm fairly new to gardening. We bought our house 2 years ago and we have lots (in the tens) of tree saplings in our garden - mainly in the lawn. We can't pull them up and the roots are usually too big for secaters so use loppers on them - even though they are only a couple of inches tall. I just tried to pull a tiny one up and managed to but it also pulled up about a meter of lawn with a huge root system. It obviously didn't pull all out so it made me think all the saplings were linked to the same root. How do I kill them as I think they may be going under our conservatory and house. I don't even know what tree they are, the leaves are soft and slighly serrated, green with a slight red tinge to the outer edge.
Any help and expertise would be greatly appreciated. Thank you.