How to Revitalize Weak and Sickly Orchids
Today's plant care experience and common knowledge about orchids focuses on the topic of revitalizing weak and sickly orchids. Let's introduce some methods to achieve this.
In the process of growing orchids, it is common to encounter slow growth, yellowing leaves, rotting roots, and other unhealthy conditions due to diseases, excessive division, improper cultivation, and aging of the plants. If timely rescue measures are not taken, these weak and sick orchids will lose their ornamental value and eventually die, especially for some rare varieties, which, once gone, are hard to find again. Revitalizing weak and sick orchids is indeed an issue that orchid lovers should pay attention to. Here are some successful experiences for reference by all orchid enthusiasts.
I. Strict Disinfection
Remove the orchid seedlings from the original pot, discard the original soil, and carefully wash the roots. Use a sterilized scissor to cut off the remaining, dried, and decayed roots, then soak in a 0.5% thiophanate-methyl or potassium permanganate solution for 5-10 minutes, drain and dry in the shade. Repeat this process two to three times to completely kill the pathogens. Note that when soaking the roots for disinfection, just immerse the pseudobulbs and avoid letting water accumulate in the leaf hearts. At the same time, you can dilute the above solution five times and spray it on the leaves for disinfection.
II. Change Pots
For weak and sick orchids, clay and purple sand pots are the preferred choice. It's best to use new pots that have not been used before, as old pots may contain fungi and bacteria that cause orchid diseases. If using old pots, they should be cleaned and exposed to sunlight for several days or scalded with boiling water before reuse for safety. Use a pot mat at the bottom to ensure good drainage and ventilation. You can purchase a special water drainage cover or use natural materials like peach and walnut shells. The height of the pot mat should be 1/3 to 1/2 of the pot's height. The volume of the pot should be small rather than large. The roots of weak and sick orchids are fragile, and a large pot can easily cause waterlogging, leading to root rot. Using a small pot can avoid this issue.
III. Select Substrate
The adaptability of weak orchid seedlings is poor, so it's best to use a granular substrate with moderate fertility, low fat content, and good ventilation and permeability, such as ceramsite, expanded stone, coarse sand, broken brick particles, Emei Xian soil, and碎石. You can also wrap the roots and pseudobulbs of the orchid in sphagnum moss before planting them in a pot with the above substrate, which also works well. All substrates need to be disinfected before use. It is not suitable to use humus soil to plant weak orchid seedlings. First, humus soil collected from the forest contains many杂菌, which are difficult to completely sterilize. Second, humus soil tends to harden after use, which has poor permeability and is not conducive to the growth of orchid roots.
IV. Adjust Temperature and Humidity
Plant the weak orchid seedlings a bit deeper to protect the pseudobulbs and keep them moist. The substrate in the pot should be kept moist, as too much or too little water is not good for the orchid to recover. During the dormancy period, you can add some substrate to cover the pseudobulbs to keep them moist and prevent frost. In the following spring, when the temperature is above 15℃, promptly remove the additional substrate added during the previous winter to facilitate the germination of new buds. The temperature should usually be maintained between 18-28℃. Orchid seedlings should be placed in a location with scattered light and away from direct sunlight. You can place some water basins or trays around the orchid pots to increase the humidity of the environment.
The above is [] a specific introduction on how to revitalize weak and sickly orchids, hoping everyone will enjoy it!