What if the leaves of cycad, a beautiful ornamental tree, turn yellow? What varieties do you have? What are the value functions?

Cycad is a beautiful ornamental tree species, cultivation is very common, cycad is a light-loving plant, improper maintenance can easily lead to cycad leaves yellowing. So do you know what to do if the cycad leaves turn yellow? What varieties do you have? What are the value functions?

What if the cycad leaves turn yellow

1. Lack of light

In the period of cycad growing new leaves, it is necessary to maintain the whole sun until the leaves harden and then move to the semi-shade. If sufficient light is not guaranteed during the growing period, it is easy to cause the leaves to turn yellow.

2. Improper watering

Improper watering can be divided into two cases: overwatering and underwatering. In the growth period of the new leaves of Tieshu, it is necessary to provide sufficient water, but do not let the basin soil wet for a long time, otherwise the roots are easy to lack oxygen, resulting in poor plant growth, and then the leaves are yellowed. Of course, lack of water can also cause leaves to yellow. the specific characteristics are that the leaves turn yellow from the bottom up, and the old leaves turn yellow first. if they are not watered in time, the leaves of the whole plant will turn yellow and even die.

3. Improper fertilization

If you apply too much fertilizer, or if the concentration of fertilizer is too high, it will also cause the cycads leaves to turn yellow. The young leaves are thick and glossy, and the surface is uneven. The solving measures are to control the use of fertilizer, middle ploughing and proper watering. If the young leaves and tender stems of Cycas begin to yellowing first, it is likely to be caused by insufficient fertilization and long interval of fertilization. At this time, it is necessary to apply fertilizer in time, otherwise it will lead to yellow leaves and even death of the whole plant. It should be noted that a large amount of heavy fertilizer should not be applied at one time, otherwise it will cause root burning.

4. Soil alkali.

Cycads like slightly acidic sandy soil, soil alkalization will also make cycads leaves yellow, you can use ferrous sulfate solution 500 times the solution to irrigate basin soil, once a week, continuous irrigation several times, can alleviate the yellowing degree of leaves.

5. Diseases and insect pests

Diseases and insect pests are also one of the reasons for the yellowing of cycad leaves. Carefully observe whether there are red spiders and shell insects on the leaves and spray them in time for corresponding control. If macula appears on the leaves, carbendazim can be sprayed to kill bacteria.

2. What are the varieties of cycads

1. Forked leaf cycad

Also known as Longkou cycad. Mostly distributed in Vietnam and its vicinity. The stem is relatively short, the height is only about 20-60 cm, the base is about 10-12 cm thick, the thickness of the apex is about 4-6 cm, the epidermis is flat, the color is dark red. The length of the big pinnacle leaf is 2-3 meters, the distance between the lobule leaves is about 4 cm, the length of the lobule leaf is 20-30 cm, the width is between 2-2.5 cm, and the protruding direction is irregular and fork-like growth. the special feature is that the leaf edge of the leaflet is wavy, the apex is obtuse, and the surface of the young leaf is covered with white powder.

2. Brazilian iron tree

The scientific name is Xianglong Blood Tree, and there are Brazilian Millennium Wood, Phnom Penh Dragon Blood Tree and other nicknames, taller, height can reach more than 6 meters, potted height is generally 50-150 cm, branched. The leaves are clustered at the top of the stem, curved and arched, bright green and glossy, and the flowers are small and fragrant.

3. South American cycad

South American iron tree is mainly single-dried, with a dry height of 15-30 cm, few branches, sometimes tufted, cylindrical shape, and dark brown leaf scars densely distributed on its surface. Its leaves are mainly composed of large even-pinnate compound leaves, with leaves about 60-120 cm long and petioles 15-20 cm long. The number of pinnate leaflets is about 7-12 pairs, oval, unequal on both sides, dioecious, male inflorescences pine ball-shaped, female inflorescences palmate.

4. Castor tooth cycad

The country of origin is located in the southwest of Yunnan, in addition, it is distributed in India, Nepal, Myanmar, Thailand, Cambodia, Vietnam and other places.

The height of its stem is about 3 meters, which is cylindrical. The length of the big feather leaf is about 1.2-1.5 meters, there are lobulate leaves on it, about 80-120 pairs, its length is about 15-20 cm, the width is about 0.6-0.8 cm, the edge turns slightly downward, the shape is thick leathery, very hard, and asymmetrically arranged, there are thorns on both sides of the petiole, sparse, the thorns are about 2 mm long, and the apex bends slightly downward.

What are the value functions of cycads

1. Ornamental value

Cycad is a famous ornamental tree species, which has a long life and beautiful appearance, with a quaint tree shape, sturdy trunk, hard as iron, showing a kind of toughness and strong vitality. In addition, the feathered leaves of cycads are smooth and bright, evergreen all the year round, which has a good effect on beautifying the environment. In the south of our country, it is mostly planted beside the courtyard steps or in the lawn, while in the north, it is suitable to be used as a large potted plant to decorate the courtyard, corridor and hall, which is very beautiful.

2. Medicinal value

Cycad leaves, flowers, seeds, roots can be used as medicine, it can be said that the whole body is a treasure of the plant. Cycad leaves can be picked throughout the year, mainly containing sugars and amino acids, the main functions are clearing heat, hemostasis, dispersing blood stasis and so on. It also plays a certain role in swelling and pain, urine and stomachache. The flower of cycad can be mainly used to treat regulating qi and relieving pain, tonifying kidney and strengthening essence and so on. Cycad seeds can be used to calm the liver and lower blood pressure. For high blood pressure. Cycad seeds can be used to calm the liver and lower blood pressure. The root of cycad can be used to treat pulmonary tuberculosis, hemoptysis, toothache, low back pain, kidney deficiency, fall injury and so on. Generally speaking, cycad is a plant with a variety of medicinal values.

3. Edible value

The stem of the iron tree contains starch and is edible. Iron leaves are rich in amino acids and sugars, which can provide sufficient nutrients for the human body. Under normal circumstances, eating iron leaves will not cause side effects on the human body, but pregnant women can not eat, otherwise it may affect the health of the fetus and mother.

Time: 2019-03-15 Click: