What if the leaves of Catharanthus roseus turn yellow

When you first see Catharanthus roseus, you must think of Changchun in China. In fact, this kind of flower has nothing to do with Changchun. Catharanthus roseus is mainly cultivated in the area south of the Yangtze River in our country, and the cultivation time in our country is not long. Because the flowering period of this kind of flower is very long, it can be seen blooming almost all the year round, so it is a common flower in our daily life. But in the process of breeding, we often find that this kind of flower will appear yellow leaves, what should we do at this time? The following pro-agricultural network will introduce to you the causes of the yellowing of the leaves of this kind of flowers, as well as the solutions after the yellow leaves.

1. Soil alkalinity

Catharanthus roseus can grow well in general soil, except in saline-alkali soil. Catharanthus roseus does not have strict requirements for soil, and it is appropriate to use ventilated, fertile and well-drained soil. If the soil is slightly alkaline, it will lead to poor growth of Catharanthus roseus, causing leaves to yellowing and not blooming.

Solution:

The acidity and alkalinity of the planted soil should be tested before planting, and if the soil is partial to alkali, it should be treated. You can buy acidic soil directly in the florist, or add ferrous sulfate solution to the soil, which can not only acidify the soil, but also increase soil fertility.

Second, the soil permeability is poor.

Poor soil permeability is also the reason for the yellowing of Catharanthus roseus leaves. Many people plant flowers with high soil viscosity and poor water permeability. There is no problem with this kind of soil in the short term, but over time, the poor permeability of the soil results in poor breathing in the lower roots of Catharanthus roseus, resulting in frequent yellow leaves and fallen leaves.

Solution:

We should pay attention to the choice of soil. It has been introduced that it is appropriate to use soil with good ventilation and good drainage. When planting, we should choose sandy soil with good drainage performance to plant, and we should also pay attention not to overwatering.

Third, too much watering

Catharanthus roseus avoid dampness and fear of waterlogging, basin soil watering should not be too much, otherwise it will affect root breathing and cause old leaves yellow, new leaves yellow.

Solution:

Catharanthus roseus originates from the tropics, watering should be strictly controlled during breeding, drying is better, and drainage should be paid attention to in the rainy season.

Fourth, too little watering

It's no good to water too much, so can you water less? The answer is no! If the water is too little or not watered thoroughly for a long time, the plant can not absorb enough water, the new leaves will wilt, and the old leaves will turn yellow and fall off.

Solution: during the breeding period, we should pay attention to observe the growth of the plant after watering, find the most suitable amount of water for growth, and implement the principle of "no dry, no watering, watering thoroughly".

5. Excessive fertilization

When growing flowers, many novices always worry that the nutrition of the flowers can not keep up with them, so they often fertilize the flowers. In fact, fertilization does make the flowers bloom more and more beautifully, but if they are too frequent, it will be counterproductive. If regular fertilization, Catharanthus roseus is difficult to fully absorb, fertilizer residue in the soil, always around the root, resulting in the whole Catharanthus roseus malaise, slow growth, less flowering, petals smaller.

Solution:

Catharanthus roseus can be applied alternately by compound fertilizer and liquid fertilizer, and do not apply fertilizer casually at other times. Watering the next day after fertilization promotes the absorption of nutrients.

These are the treatment methods for the yellowing of Catharanthus roseus leaves introduced by the pro-agricultural network. Here, the pro-agricultural network would also like to remind you that the whole plant of Catharanthus roseus is toxic, but the extracted Catharanthus roseus is also a cure for cancer, so usually no matter you plant it or when you see it by the side of the road, don't eat it at will.