Potted Dendrobium
1, naturally aging yellow leaves
No matter what kind of Dendrobium, the branches will age. The resistance of aging branches decreases, the leaves turn yellow from bottom to top, and then the stems turn yellow and wrinkle, ending their lives. Under normal circumstances, the branches of Dendrobium will grow for about three years, and the phenomenon of yellow leaves and yellow stems will appear due to aging. This is normal, there is no need to worry, how to raise or how to raise it will not affect the growth of Dendrobium.
The red circle is the branch of Dendrobium, and all the leaves have fallen out.
Characteristics of natural aging yellow leaves
When Dendrobium naturally ages yellow leaves, yellow leaves will only appear on mature branches, and new branches and strong branches will remain green and unaffected. In addition, when the branches of Dendrobium are old and yellow, the color of the leaves changes from green to yellow, and the color is relatively pure, with no spots or yellowish brown. Most of the old branches of Dendrobium begin to appear yellow leaves and stems after flowering. Some aging branches of Dendrobium don't turn yellow immediately after flowering, but begin to turn yellow in winter when the temperature is relatively low and the temperature difference is large.
Yellow leaves are old leaves of Dendrobium, with no spots and pure color.
solution
When Dendrobium branches naturally age, leaves turn yellow and stems turn Huang Shi, we only need to cut off the aging branches in time, and when the temperature is right, new buds will grow and start a new round of growth. If it is an edible variety of Dendrobium, the cut old branches can be eaten. If Dendrobium is not an edible variety, the cut old branches can be used for cutting. Although the survival rate is not as good as that of ordinary flowers and plants, there is still hope to breed seedlings. After pruning the old branches, it is best to spray carbendazim equivalent to 0/000 times of the whole Dendrobium/Kloc-0, with more ventilation and proper illumination to prevent the wound from rotting and affect the growth of healthy plants.
The old stems of Dendrobium no longer grow leaves.
2, low temperature, frost leaves turn yellow
The cold tolerance of Dendrobium is not very good, most species can withstand the low temperature above 0 degrees, and some species can withstand the low temperature of MINUS 5 degrees. The cold tolerance of family potted Dendrobium can not be compared with that of wild Dendrobium. It is suggested that the varieties that are not cold-tolerant in winter should be placed in the environment above 5 degrees, and the varieties with good cold tolerance should be placed in the environment above 0 degrees. If the temperature of Dendrobium is too low in winter, or frost appears, the leaves and stems will turn yellow, or the whole pot will die.
Wild Dendrobium whose leaves turn red and yellow at low temperature.
Characteristics of yellow leaves in low temperature frost
When Dendrobium leaves turn Huang Shi due to low temperature, frost and other reasons, not only the leaves of mature old branches will turn yellow, but also the new leaves at the top of branches will turn yellow and red. Especially at the top of the branches of new seedlings, when frostbite occurs at low temperature, the leaves are either red or blanched in boiling water. In other words, when Dendrobium undergoes low temperature or frost, the mature old leaves will turn yellow, and the newly grown young leaves will also change. When the ambient temperature is relatively low, or it has frosted, and the old leaves and new leaves of Dendrobium turn yellow and red, the problem of frostbite should be considered.