How does gardenia leaf blacken do?

Gardenia, also known as yellow gardenia, gardenia, etc., bright green leaves, evergreen four seasons, large white flowers, fragrant and fragrant, but also have a certain ability to resist shade and toxic gases, so it is a good material for greening, beautification and fragrance, it is very suitable for balcony greening, potted flowers, cut flowers or bonsai, and so on. Let's take a look at the blackening of gardenia leaves.

Why are the leaves of gardenia black?

1. Overwatering: the reason for the blackening of gardenia may be that the roots can not breathe or even rot.

2. The temperature is too low: the suitable temperature for the growth of Gardenia jasminoides is 16-18 ℃, and the reason for the blackening of leaves may be that the temperature is too low.

3. Disease and insect harm: the blackening of gardenia may also be caused by aphids, whitefly, shell insects and so on.

4. Root injury: if the root injury of gardenia can not provide enough nutrients to the plant, the leaves will blacken.

How does gardenia leaf blacken do?

1, reasonable watering: gardenia blackening leaves should first think of the watering problem, the watering principle is to see the basin soil dry and then watering, and each watering should be thoroughly, when the climate is relatively humid, we should control watering.

2. Temperature management: gardenia flowers should be maintained in a sparse forest or shade shed with good ventilation, high air humidity and light in summer, and dormant in an environment where sunshine and temperature are not lower than 0 ℃ in winter.

3. Disease and pest control

① aphids: aphids can use two pieces of garlic to break into juice and 1 liter of water, and then spray diseased plants.

② whitefly: whitefly can be removed with 1g washing powder, 120ml water and a few drops of peanut oil, mixed and sprayed or wet with a brush.

③ scale insects: scale insects can be removed by dipping cotton sticks with alcohol or soapy water.

How to cultivate gardenia?

1. Potted soil: gardenia is an indicator flower in acidic soil, and the suitable pH value is 5 to 6. Cultivation soil can choose rotten leaf soil, peat soil or retting sawdust plus half of the garden soil, avoid using old wall soil and cinder, with the market of gentleman orchid soil is more convenient and practical.

2. Watering: gardenia likes moist soil and large air humidity. Keep the basin soil moist during the growth period from April to September. Usually the basin soil can be watered once it turns white. However, after the flower budding, watering should not be too much, so as not to cause bud drop.

3. Fertilization: gardenia is a fertilizer-loving plant. The cultivated soil is supplemented with 3% rotten cake fertilizer as base fertilizer, and the alum fertilizer made by cake fertilizer and ferrous sulfate retting is watered once a week during the growing season. 0.1% potassium dihydrogen phosphate aqueous solution can make the flowers hypertrophic and fragrant.

4. Illumination: gardenia flowers like light and can grow in semi-shade for a long time, but the flower branches are longer and the flowers are less. Except for the strong light from July to August noon and the dormant period in winter, gardenia generally need to be maintained in the sun in order to blossom and flourish.

5. Pruning: gardenia is trimmed lightly after flowering every year, cutting off internal bore branches, diseased and weak branches, and individual long branches are truncated. But remember that gardenia can not be cut short in spring, otherwise it will not blossom in that year.

6. Change the soil: it is better to change the soil in March in spring. Cut off part of the old root after pouring the pot, shake off half of the old soil, pour water after planting in the pot with new soil, put it in a warm semi-shady place, and keep it in the sun when new buds sprout.

7. Overwintering: gardenia can overwinter in the open field in Qinling Mountains of China, but the roots of potted gardenias will be damaged after severe winter. potted flowers can be put in a cold room of about 5 ℃ to make them dormant, protect their roots, and overwinter in leeward and sunny places. Spring recovers quickly and blooms early.