according to my own experience: yes. there was a very old cherry tree at my garden that we decided to cut one day. (8 or more yrs ago). done with that, and after each year I have to cut the new sprouts. i found impossible to eliminate all the roots of that tree, and they still exist, and give new sprounts each summer...

with the Sea buckthorn -- i am basing my statement on what I was told by our village neightbour, old experienced granny