Two ways to raise orchids

I. Management of Orchid overwintering

Orchids are generally moved indoors or in greenhouses in mid-November, and are easily affected by frost or even frost damage. In daily management, in addition to strengthening general overwintering measures, attention should be paid to differential treatment according to the characteristics of different varieties.

1. The ancients had the experience of "suitable exposure in cold weather". Orchids should be placed on a sunny windowsill or tables facing south. The suitable temperature for orchid growth is 1525 ℃, and it is generally better to survive the winter in a low greenhouse of about 10 ℃. If the indoor temperature is lower than 5 ℃, blankets or cotton blankets should be used to cover glass windows and cracks at night to prevent freezing. However, the overwintering temperature should not be too high, otherwise the orchid will grow weaker after spring, and the temperature difference between day and night should be maintained at 4: 5 ℃, otherwise it will not be easy to grow luxuriantly in the coming year.

2, "winter is not wet", should pay attention to winter and spring, plant growth is slow, should not be too much watering, orchid overwintering, it is appropriate to keep slightly wet and dry, spring orchid flower buds should be gradually formed in winter, but also moist; while Jianlan and Cymbidium can be slightly drier, the pot soil is not dry for the degree; watering, should be poured from the basin edge, do not pour into the orchid heart, lest the heart die.

3. In winter, it is common to have bright scattered light. If the light is too dark during the overwintering period, it will affect the formation of flower buds, so there are few pregnant buds, even only long leaves do not blossom.

4. Ventilation and ventilation when the outdoor temperature is higher than 10 ℃, it is often found that the outer wall of the flowerpot is humid and the orchid leaves wilt slightly, which is caused by excessive indoor heat and poor ventilation. The doors and windows should be ventilated during the day to prevent the breeding of diseases and insect pests, but special attention should be paid to not letting the cold wind blow the orchid leaves directly, do not let the orchids come into contact with soot, find dirt on the leaves, wash them immediately and keep the leaves bright and clean.

Second, the effect of topdressing outside the root of orchid is good.

If orchids rely solely on root absorption, it will have many shortcomings due to the effects of environmental conditions and absorption function, which can be made up by extra-root forced fertilization.

Nitrogen, phosphorus and potassium can be used alone or mixed; according to the specific growth conditions of orchid plants, such as 0.2% ammonia dihydrogen phosphate, play the role of both nitrogen and potassium fertilizer. In addition to phosphorus, 0.2% potassium dihydrogen phosphate can increase the intensity of photosynthesis, increase the nutrients stored in pseudobulbs, and enhance the ability of orchid plants to resist disease and cold. If total nutrition of nitrogen, phosphorus and potassium is needed, potassium phosphate can be used to supply phosphorus and potassium. Ammonium sulfate can supply nitrogen; boric acid is added to supplement the deficiency of trace element boron in soil, and boron has an obvious effect on flower bud differentiation and flowering. The effective preparation ratio is as follows: 3 liters of water plus 1 gram of potassium dihydrogen phosphate and 0.2 grams of boric acid, but trace amounts of less toxic agents such as trichlorfon and thiophanate can also be added to prevent diseases and insect pests.

Generally in the evening or in the morning, spray on the stems and leaves while there is dew on the leaves, which is easy to be absorbed with the dew; when spraying, spray the leaves on both sides and spray them on the back of the leaves as far as possible.