The reason for the yellow leaves and burnt tips of orchids

Orchids are often prone to yellow leaves or leaf scorched tips in the process of growth and development, which reduces the ornamental value. Cause more, mainly have the following four aspects.

1. Too much or too little watering

Orchids like humid climate, especially high air humidity. If the long-term watering is insufficient and the air is too dry, the root will dry and shrink, the absorption function will be weakened, and the supply of water and nutrients will fall short of the demand, resulting in yellow or scorched leaves. On the contrary, too much watering, basin soil is too wet for a long time is also easy to cause root rot, the emergence of yellow leaves, and even death.

2. Excessive or insufficient illumination

The cultivation of orchids, such as improper placement, excessive or insufficient light, will also cause yellow leaves, scorched tips or leaf edges to scorch.

3. Excessive fertilization

Orchids should be light and fertile, not thick or raw. If the fertilizer is too thick at one time, especially the excessive application of chemical fertilizer, it will often cause root damage, and then cause yellow leaves or scorched tips.

4. Diseases and insect pests

Orchids are attacked by diseases and insect pests, which will also cause orchid plants to injure leaves and roots, resulting in yellow leaves and scorched tips. In addition, the pH of cultivated soil is not suitable (alkaline soil), long-term unfertilized or unchanged soil, and environmental pollution, all of which are easy to cause orchid leaves yellowing, withering or leaf tip scorching.

In view of the above reasons, the following preventive measures can be taken:

1. Watering should be scientific.

According to the season, the stage of growth and development and the dry and wet conditions of the basin soil, we should decide whether to water and how much water should be watered, especially to increase the air humidity so as to avoid the basin soil being too dry or too wet for a long time.

2. Fertilization should be reasonable.

Thin fertilizer should be applied skillfully, and thick fertilizer and unrotten liquid fertilizer should not be applied. Water should be watered once in the morning after fertilization to dilute the fertilizer and avoid the occurrence of fertilizer damage.

3. The light should be suitable.

Orchids like semi-shade, except for more sunshine in early spring and winter, shading measures should be taken in time after summer to avoid direct light, preferably under the shade shed or in the shade of the building.

4. Timely prevention and control of diseases and insect pests

It is necessary to prevent diseases and eliminate pests as soon as possible, and special attention should be paid to the prevention and control of anthrax, black rot, shell insects and so on.

5. Soil should be used properly

Select slightly acidic, loose and fertile culture soil, and pay attention to timely change of basin and soil, regular application of ferrous sulfate solution to keep the basin soil slightly acidic.