Jasmine is a small shrub, the annual bud can grow to 60 ~ 70 cm or even higher, and keep flowering. In the second year, on the main stem of the first year, side branches can be drawn, but there is no obvious high growth. In the second year, at the same time, several branches, a dozen branches, or even twenty branches grew from the base of the plant in vain, which is often called "water moss". This kind of water moss is the material basis for jasmine to prolong its economic life. Play a role in renewing old branches. As far as the main stems are concerned, the second and third years are the peak periods of flower production. After the third and fourth years, if it is not cut off from the base to promote the development of new shoots, it will not only weaken the growth, but also waste nutrients, affect ventilation and light transmission, and seriously hinder the second and third generation main stems from exerting their high-yield potential. It is precisely because jasmine has the habit of pulling branches from the root neck that the number of main stems of each jasmine can develop rapidly and the aging main stems can be replaced quickly from generation to generation.

However, it is necessary to properly treat the long branches, so that they can not only exert their flower production potential, but also play a role in rejuvenation. This is pinching, or topping. So as to regulate the relationship between vegetative growth and reproductive growth. Because the terminal bud is the center of auxin production, when the terminal bud is removed, the synthesis center of auxin will be destroyed, and then the inhibition of high concentration of auxin on lateral buds (because auxin is sinking) will be ruled out, and the lateral branches will grow. Water and fertilizer are no longer supplied to the terminal buds, but distributed to the lateral branches, which grow moderately but not excessively, which is beneficial to the transformation to flowering branches.

It is observed that except for a few long branches, bud differentiation of new buds in leaf axils begins at the same time as bud germination. When they grow to 5 ~ 9 pairs of leaves, buds appear. However, the long branches from the base of the plant grow to 10 pairs of leaves, and when they grow to 40 cm high, 60% have no buds and 40% have a few buds. If you don't pick the heart in time, you can grow to 2 1 pair of leaves, to 1 10 cm, and there is still no bud. Some people crawl on the ground like vines without the support of lateral branches, which can grow to more than 2 meters. Long branches generally germinate from late June to early July and don't stop growing until winter.

In order to make the long branches of the apostles turn into flowering branches (and tighten the plants), the number of plants per unit area should be increased without covering each other and affecting the light. When the long branches are 30-40 cm long and there are no buds, pick the hearts and let them bloom in the axils of leaves. The length of coring should make the remaining part equal to or slightly shorter than the height of the main stem.

After enucleation, 2 ~ 8 new branches can usually be produced in the axils of long branches, of which 1 ~ 7 branches are transformed into flower branches. For example, in autumn, the ability to promote new shoots is greatly weakened after coring, and only 1 ~ 3 branches can be transformed into flower branches, and buds appear. There are still a few virtual branches in late autumn, which should also be denucleated. But the purpose of coring at this time is not to promote the flowering of branches, but to stop the growth of branches as soon as possible, accelerate lignification and enhance cold resistance.

Although it is the biological characteristics of jasmine, climate, soil conditions, water and fertilizer and management level can greatly affect the germination of long branches. If the temperature is high, there is much rain, the soil is good, the fertilizer is sufficient, the management is fine, and the long branches are pumped more and the pumping is high; On the contrary, there are fewer students. If the planting density is too high, it will also affect the germination of long branches.

Jasmine has a short life span, and its living ability is reduced due to long-term use of asexual reproduction. Usually after 4 ~ 6 years, a main stem will obviously wither. Its plant growth potential is weak, slender branches increase, flowering quantity decreases, inflorescence bud quantity is less, flowers become smaller, and aroma quality decreases. At this time, although it did not die, it also seriously affected its economic value. In order to improve the output and output value per unit area, timely updating measures should be taken.