The flower stem of the Jianlan I planted is already 5 cm long. Can you still fertilize? Is it necess

A little phosphorus and potassium fertilizer can be applied.

Orchid grass grows good but does not open source flowers, this is to find the reason from your daily management, others do not know, now a few dao are listed, please sit down:

1. Lack of low temperature, not yet winter, when the temperature is still high, move into the room early and deal with it according to winter.

2. Lack of light, although bluegrass likes shade, but there is not enough light for a long time, it will also lead to no flowering.

3. The fertilizer only topdresses nitrogen fertilizer, and phosphorus and potassium fertilizer have not been supplemented for a long time, the nitrogen fertilizer function promotes the growth of seedlings, potassium fertilizer resists lodging, and phosphate fertilizer promotes flowers and fruits, all three are indispensable.

4. The temperature difference between day and night is too small, such as long-term storage indoors.

Yes, the fertilization of Jianlan: Take "according to the conditions of the orchid, look at the seedlings and set the fertilizer, rather light than thick, timely and thin". That is, according to the orchid species, seedling potential, physiological characteristics, grasp the timing.

Dry fertilizer use: beef bone meal (nitrogen content 4%, phosphorus grass wood ash (phosphorus potassium, cake fertilizer (nitrogen 7%, phosphorus and potassium and fire soil mixed fertilizer preparation and compound fertilizer alternately use not less than 4 times a year in the pot. Liquid fertilizer is filtered and diluted with decomposed organic matter fertilizer, urea, potassium dihydrogen phosphate or special flower fertilizer alternately used as top dressing or extra-root fertilization, generally once every 15 days, sprayed with water once before and after two days before and after spraying outside the root, rinsing dust and liquid residues.

Fertilization time. Germination fertilizer (late spring and early summer): dry fertilizer once or twice, fertilization outside the roots once every 10 days, mainly nitrogen and potassium fertilizer, promote the extraction of aboveground stems and leaves, and the expansion of underground roots. Growth Fertilizer (Late Summer and Early Autumn):

The sprout leaves elongate to promote the vigor of the sprouts, mainly nitrogen, diligent and thin, after the sprouts open the leaves, potassium is the main to promote the seedlings, and the potassium dinitrogen phosphate is sprayed once a week. Flower fertilizer: when the new shoot leaves no longer grow, it will be transferred to the flower bud differentiation stage, mainly phosphorus, dry fertilizer twice, and fertilization outside the root once a week.

In late autumn and early winter, during the period from cold dew to the beginning of winter, the orchid will be transferred to the dormant period, with dry fertilizer once, liquid fertilizer twice, and foliar spraying once every 10 days to ensure safe wintering, including ointment and beauty, and improve the germination rate in spring.

Why can't orchids be fertilized immediately after flowering? After reading it, I understand.

Jianlan growing conditions.

The environment in which Jianlan grows can be a warm and humid semi-shady environment. Such an environment is conducive to its growth, and its cold resistance is poor. The overwintering temperature is not lower than 3, afraid of direct sunlight, not tolerant to waterlogging and drought. It should be grown in well-drained, loose, fertile soil.

How to raise Jianlan.

Maintenance of Cymbidium grandiflora It is best to put it in a well-lit place with as little shade as possible, otherwise it is not easy to bloom. Some large-flowered orchid varieties still need to be exposed to the sun for daily maintenance, for fear of frost damage. They are cultivated in the north of the Yangtze River, and it is best to maintain them indoors in a warm environment in winter, and the temperature should not be lower than 0, otherwise they are prone to frost damage.

Jianlan watering. Jianlan prefers a warm, semi-shady environment. In spring, the temperature is not high, and the evaporation of water is slow. The watering time is generally once every five days. In summer, the temperature is high, and it is necessary to water frequently, generally once every three days, and the potting soil is mainly moist.

Jianlan fertilization. The fertilization of Jianlan is generally decided according to its own growth. When you find that the leaves of the orchid have turned yellowstone, this is a sign of lack of fertilizer, and it is time to fertilize.

Jianlan pest control.

A common pest of Jianlan is a nematode, which parasitizes the roots of orchids. As a precaution, the cultivation medium should be disinfected to kill the eggs. If the damage is severe, the potted plant should be replaced immediately and replanted.

Anthrax fever is also common. In addition to improving the environmental conditions of the end of the year, the prevention and control methods can be sprayed with methyl tobuzin every 7-10 days during the onset of the disease, and then supplemented with Bordeaux solution every half a month.

Jianlan Family Raising Law.

1.It is best to keep the temperature at which orchids grow at 15 to 23. In summer, when the temperature exceeds 28, pay attention to cooling and shading.

In winter, when the temperature drops below 10, be sure to put it out in the sun and use light to help it grow. 2.When watering the large-flowered orchid, be sure to follow the principle of seeing the dry and seeing the wet.

The water needs to be poured slowly with fine water, so that the water fully penetrates the soil, there is enough water in every corner, but we can not water too much. Just look at the bottom of the pelvis and see if any water is seeping out. 3.

Jianlan likes shadows and astigmatism. The shade reaches about 30% in winter and spring, and about 75% in summer, but it should be noted that when the temperature is 10 in winter, the plants need to be exposed to sunlight all day. 4.

Orchid fertilization can be done with orchid fertilizer or agricultural compound fertilizer. Generally, granular compound fertilizer is directly placed on the surface of the potting soil, then covered with some soil, and then watered. A pot of orchids can be applied with five kinds of compound fertilizers at a time.

Precautions for Jianlan maintenance.

If you find that there are a small number of old leaves on the large-flowered orchid that turn yellow, you need to cut it off in time. Be careful not to water too much when watering, otherwise there will be stagnant water and the roots will rot easily.