Naturally, yes, 树根要比树冠大很多, but the primary branches are not so big, about the same size of the trunks and primary branches above ground. In landscapes? No, you have to make sure you do everything right to make it happen. If you've ever seen any photos of trees pulled out during hurricanes , you might notice that their roots are much smaller, probably that's why they were pulled out and those deep-rooted survived.