Yesterday I received an order of pond baskets that I intend to use to pot up some Scots Pine seedlings that I started last year. I just thought that I would show one so that those of you who are not aware of this technique could take a look.
The advantage of this technique is twofold. Firstly, it provides the excellent drainage that is so important for developing bonsai, particularly Pines. Secondly, when new rootlets emerge from the holes in the pots they die back, this in turn encourages new roots to emerge from deeper inside the pot. The idea is to promote a fibrous, ramified root system that will be beneficial later in the life of the tree.