The wild trees in our garden

My mother-in-law noticed something from one of the pictures we sent her recently: the plants growing by the garden shed are actually trees. We thought they were weeds. But no, they are the offspring of the big towering tree that stand by the parking lot at the back. I love that tree but I had to cut the offspring. I guess I will have to find a way to take off the roots, otherwise it will damage the shed and the fence. It is going to be fun: I'm ill equipped and I'm a lousy gardiner. But let's look at the bright side: it means trees can grow in our garden. I might one day plant some I like.