"A tree's shape aboveground--tall and narrow or low and spreading--usually resembles that of its roots below," Lin says. "So if you want a tree to grow in one direction, just cut off the roots on the other side." Soil is important, too.
「通常樹的外表和土裡的根相一樣，往上直長的樹，根必也是往下直長，往四周發展枒杈的樹，一定有四面盤結的根」，林國承說：「所以想要樹往那邊長，就修掉它另一邊的細枝根。」