How does Eichhornia crassipes survive the winter?
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Eichhornia crassipes is an aquatic annual herbaceous plant of the Pontederiaceae family, also known as凤眼蓝 (Phoenix eye blue), Eichhornia seedling, water floating lotus, narcissus, etc. It is native to Brazil. Originally from the tropics, Eichhornia crassipes has strong繁殖力 (reproductive power), high yield, and tender texture, making it good feed for pigs. Eichhornia crassipes is sensitive to cold and can easily freeze to death when the water temperature is below 7°C. How does Eichhornia crassipes survive the winter?
1. Selection of overwintering seedlings. Choose new and strong plants, and remove diseased and rotting leaves to use as seedlings.
2. Build a simple greenhouse: In winter in cold regions, Eichhornia crassipes usually overwinters in indoor pools, with about 5 kilograms of Eichhornia crassipes placed per square meter of pool area.
3. Move Eichhornia crassipes to a separate pool at the autumn equinox, keep the plants sparse, and let them in a solitary state, where large leaves gradually wither and rot, and small Eichhornia crassipes increase, using these small Eichhornia crassipes as seedlings for overwintering.
4. During the overwintering period, the greenhouse should prevent high temperatures, preferably storing at low temperatures to keep Eichhornia crassipes in a dormant state. The water temperature in the pool should be maintained at 15-20°C, below 7°C easily leads to death, and above 35°C causes old plants to rot and new stems and leaves to turn yellow and shrink. The greenhouse must always maintain fresh air, and ventilation should be maintained every day to ensure adequate sunlight indoors.
5. Fertilization should be noted during the overwintering period, preferably using decomposed animal and human manure diluted at a concentration of 1:20. When fertilizing, first gently move the seedlings to expose the water surface, then apply the fertilizer to the water, and do not pour it directly on the seedlings.
6. Change water: Generally, change the water every two months, and the temperature difference of the water should not be too great.
7. During the overwintering period, if aphid infestation is found, it can be controlled by spraying with 40% dimethoate diluted 2000 times with water.
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