Why can gardenia leaves appear blackened and withered?

"gardenia blooming, so beautiful so white, this is a season, we will leave" this campus song of he Jiong is very familiar to everyone, in which the impression of gardenia is particularly deep. Gardenia is pure and elegant, although it does not have the beauty of peonies and the delicacy of roses, it does not have an elegant charm. Gardenia flowers generally appear in the mountains, now many people plant potted plants at home, not only beautiful, every flowering season the whole room has a faint fragrance. Recently, a friend asked why the leaves of gardenia are blackened and withered. Let's explore together.

I. improper watering

Gardenia can not be watered too frequently, usually wait until the soil surface begins to dry before watering, otherwise it will produce stagnant water, slowly the roots will rot slowly because they can not breathe, the whole gardenia will have no nutrients, and will slowly show on the leaves and begin to turn yellow, dry and even blacken and fall.

At this time, we should water gardenia according to the specific situation, neither too much nor too little. If the above root rot occurs, the rotten part needs to be cut off before transplanting. In summer, the amount of water can be increased appropriately, while keeping the soil moist, you can spray water on the leaves to cool down, not too much at one time.

Second, caused by insect pests

Gardenia flowers can also cause blackening and withering of their leaves if they are infested. This situation occurs because many people do not know what the main pests are, and they are not well prevented or treated in time.

Generally speaking, the common pests of gardenia are aphids, vermicelli, shell insects, etc., mainly prescribe the right medicine to keep the leaves clean, and then put them in a cool and ventilated place after treatment to observe the recovery of the leaves.

Lack of potassium, iron and magnesium

When gardenia leaves blacken and dry for no reason, or even the whole plant dies, it is likely to be lack of potassium, iron and magnesium, which should be distinguished according to the color of the leaves.

1. If there is a lack of potash fertilizer, it usually comes out from the edge of the leaf and then to the center, and the old leaf will change from green to brown. In this case, if it is not controlled in time, it will affect the survival of the whole gardenia, so it is necessary to supplement nitrogen fertilizer.

2. if there is a lack of iron and magnesium, it will show leaf chlorosis at first, the color of the new leaf will turn pale or white, the vein of the leaf will be green, and finally the leaf will dry up and die. If this is the case, it is necessary to timely spray ferrous sulfate aqueous solution, boron and magnesium fertilizer for prevention and control.

Fourth, the temperature is not suitable

The growth temperature of Gardenia jasminoides is 16-18 ℃. If the temperature is too low, it will go into dormancy. If the temperature is too high, it will burn the roots or leaves, resulting in blackening and death of the leaves. Especially in the hot summer, we must take proper care, generally move to the outside sooner or later, move to the indoor at noon, spray water in time to cool down.

The light is too strong

Gardenia is a kind of flower that likes semi-shade. If it is exposed to the sun in summer, it is easy to burn the leaves and cause them to die. So to appropriate shade, to avoid direct sunlight, when there is sunshine in winter should be moved to the balcony for 4-5 hours.

Conclusion: if the gardenia leaves blackened and withered, see if it is caused by the above five major causes, early detection, early solution, must not wait until the death of the whole plant to save, even if the cause is found, it is likely to die.