Hello again everybody. My neighbour has a plum tree which produces green plums. It is fairly high. However in the past two years i have been getting little plants popping out everywhere in my garden and i think they could be the plum tree sending out runners. Is this possible.

When i tried to pull them out, i had to struggle as the are really woody even though they are only about a foot high. I was just wondering if it could be her tree.

Thanks in advance.