Straight stem type means that bonsai trees have only one trunk, and the trunk posture is basically upright or slightly curved, that is, the so-called middle straight type is called straight stem type. Bonsai trees with straight stems require that the best expression of roots must be that thick roots extend in all directions, so that trees appear solemn and stable and have indomitable spirit. Suitable tree species: black pine, five-needle pine, money pine, Metasequoia glyptostroboides, ginkgo biloba, elm, etc. Most of these materials were taken from forest farms, and some were dug from Shan Ye.

Second, the bending drying type

A bent dry bonsai tree requires a certain degree of bending of the trunk, but not too much bending, one or two bending is enough. Avoid too monotonous repetition, otherwise there will be traces of human creation. Qu Gui is alive, which lies in the change of the main line, combining rigidity with softness, combining rigidity with softness, smooth lines, euphemism and combining rigidity with softness.

Third, inclined dry type

The trunk of inclined stem bonsai materials must have various deformed "S" shapes. If the trunk leans to the right, there should be thick roots on the left, and the tip of the trunk turns up, just like the sloping bonsai material for many years. If the trunk is inclined and the trunk line is straight, it lacks charm and does not conform to the laws of nature Because there will be no strong wind every day, and the trees will continue to grow upwards.