| "How to Make
Dwarf Trees" (1913):
How gardeners manage to grow miniature
pines, firs, and oaks in flowerpots for half a century has always been
more or less of a secret [sic]. It is
the result chiefly of skillful, long-continued, root-pruning. They
aim first and last at the seat of vigorous growth, endeavoring to weaken
it just as far as possible without destroying the life of the tree.
They begin with the young plant, say a seedling of a cedar or hemlock,
when only two or three inches high, and cut off its tap-roots as soon as
it has other rootlets enough to live upon, and replant it in a shallow
earthen pot or pan.
1 Scientific American, Vol. 108, May 10, 1913, pg. 432.