The pruning of newly planted black pine piles should be divided into two steps:

The first step, before and after planting, after careful consideration, completely unnecessary branches can be cut off from the base; For the branches that need to be cut short, don't rush for success, wait until they really survive, and it is best to prune them in the second year. Moreover, whether the branches that need to be shortened can be shortened depends on whether there are small side branches at the cutting place. If there are no side branches that can be preserved, new buds will not germinate at the cut-off place like fast-growing trees such as Ulmus pumila.

Therefore, when cutting short, you must choose the side branches before use, and tie them in the ideal position after cutting short. Of course, no pine branch can germinate. If it is necessary to enrich the buds, we can chop up the robust annual buds or milk buds, which can force more new buds.

Overall attitude treatment: mainly climbing, supplemented by pruning. After a year of blank cultivation, the black pine stump grows well. Developed root system, high survival rate and strong anti-smoke pollution ability.

Trunk shape: Black pine bonsai can be made into inclined dry type, curved dry type, cliff type and other shapes, and can also be made into stone-attached bonsai. Because the needles of black pine are thick, hard and long, which are not suitable for slicing, most of them are natural and show typical pine characteristics.

2. Panza

Because of the weak regeneration and germination ability of black pine trees, rolling is an important means of this kind of bonsai, and the method of branch storage and cutting is not feasible for this kind of trees. Even if it is tied, you must be careful not to break or sprain the branches in the process of tying or pulling. No matter whether it is broken or split, the phloem tissue at the wound will not form a foreskin and continue to grow like a fast-growing tree species, but will die first from the wound to the tip. If there is no living side branch from the wound to the base of the branch, the waterline will be cut off and the whole branch will gradually shrink back and die to the base.

So when you are flat, you can't push too hard, pull hard and twist hard. If you can't do it at once, you must do it step by step. In particular, to cultivate large-scale cliff (inverted) pine bonsai, on the basis of the original curvature of pile materials, it needs to be tied or pulled many times over the years to gradually increase the sag. In case of accidental injury, common clear water paint (commonly known as varnish) can be used to seal the wound, which may be effective. It takes a long time for black pine to form, and then remove the wire after it is confirmed. After a few years, if you recover from growth, you have to tie or pull again.

Modeling skills of black pine bonsai

The young branches and stems of Pinus thunbergii are soft and plastic, and can be rolled into many different styles of bonsai according to their characteristics, such as bent dry type, inclined dry type, water-facing type, cliff type and stone-attached type.

Because the needles of black pine are thick, hard and long, which are not suitable for slicing, most of them are natural and show typical pine characteristics.

According to the shape of the stump, the old pile can be shaped according to the situation, trimmed and rubbed to make a natural and beautiful bonsai. No matter what form the black pine bonsai takes, it should take Gu Song in nature as the background and refer to the pine trees in the painting, which not only conforms to the laws of nature, but also has high artistry.

The modeling of black pine bonsai can be carried out in1-March, when the sap flow is slow, and there is basically no rosin overflowing from the branches, which has little effect on its growth.

The germination ability of black pine is weak, so the original branches and stems should be used for hanging modeling, the redundant branches, stems and roots should be shrunk and cut, and their growth direction should be adjusted. The upward growing branches should be adjusted to be flat or drooping. In addition to direct-drying bonsai, other forms of bonsai should avoid rigid lines on trunks, branches and roots, so as to achieve both rigidity and flexibility.

The root system of Pinus thunbergii is developed, which can be heightened according to the needs of modeling to show its ancient charm.