How to raise potted gardenias in summer?

1. Soil: Gardenia is an indicator plant of acidic soil, so the slightly acidic environment of the soil is the key to determine the growth of Gardenia. The culture soil is made of 70% slightly acidic sandy red soil and 30% rotten leaf material. The soil pH value should be controlled between 4.0 and 6.5.

2. Temperature: The optimum growth temperature of Gardenia is 65438 06℃-65438 08℃. Low temperature and direct sunlight are extremely unfavorable to its growth, so gardenia should be maintained in a well-ventilated, high-soaked and light-filled sparse forest or shade shed in summer. In winter, let it sleep in the sunny environment with the temperature not lower than 0℃. If the temperature is too high, it will affect the flowering in the next year.

Third, moisture: Gardenia likes humid air, and it should be properly watered during the growth period. Usually when the soil is white, you can water it once and pour it thoroughly. It is hot and dry in summer. Spray leaves 2 -3 times a day to increase air humidity and help plants cool down. However, after the flowers are in bud, it is not advisable to water them too much to avoid falling buds. It is better to water dry in winter to prevent the roots from rotting.

Fertilizer: Gardenia is a fertilizer-loving plant. In order to meet the demand for fertilizer in its growing period and maintain the slightly acidic environment of the soil, ferrous sulfate can be mixed into the fertilizer solution in advance for fermentation. After entering the growing season in April, topdressing can be done once every half month (it is best to add more water when fertilizing to prevent burning flowers). This can not only meet the demand of gardenia for fertilizer, but also keep the soil environment in a relatively balanced slightly acidic environment, prevent the occurrence of chlorosis, and avoid the damage to gardenia caused by sudden supplementation of ferrous sulfate and local peracid.

5. Propagation: Although there are many propagation methods of gardenia, the floating water insertion method is the simplest and fastest. First, find a foam board to punch holes, cut off the semi-mature branches of gardenia and insert them into the small holes of the foam board, then put the foam board into a bucket filled with water, and put the bucket in an environment that can not only block the floating board cuttings, but also let the sun shine on the bucket, and control the water temperature at 65438+. The survival rate of cutting Gardenia jasminoides Ellis by this method is 65438 000%.

Gardenia, also known as Lin Lan, Peony, Peach, etc. It belongs to Rubiaceae, an evergreen shrub. Branchlets are green. /kloc-mature in 0/0. July and may flowers. Gardenia originated in the south of China, and was widely cultivated as early as the Han and Tang Dynasties, and now it is planted everywhere. Sex likes warm and humid climate and is more resistant to shade and cold.

Gardenia is changed from April to May every year, and the pot soil can be mixed with alum fertilizer residue, sand, fine slag ash and humus soil. The suitable temperature for growth is 20℃-28℃. In late spring and early autumn, the weather is hot. Pay attention to shading, preventing high temperature, direct sunlight and air circulation. Otherwise the leaves will turn yellow.

1, Soil: It is appropriate to cultivate with rich and fertile acidic soil containing humus, which is the key to the success of family planting in the north. Generally speaking, humus soil can be added with 1 serving of decomposed bean cake fertilizer and a certain amount of ferrous sulfate at the same time, or it can be put into a pot and drenched with 0.2% ferrous sulfate or alum fertilizer water for 3 ~ 5 times.

2. Cultivation: When planting with cutting seedlings and layering seedlings, it is necessary to ensure that the root system of the plant is fully stretched, and at the same time fill the gap of the root system with fine soil. The density of the fill is about 85%. Pay attention to the tightness, and the depth is about 1 cm above the root system. Water it in time after planting, and it is generally advisable to seep through the bottom of the basin.

3. Management and maintenance: Gardenia requires high air humidity, so families in the north can put clean water in the basin mat and place a thin plate (about 3 cm). It is advisable that the water in the basin should not pass through the thin plate, and the flowerpot can be placed on the thin plate. Pay attention to frequent hydration. The principle of watering is to dry thoroughly, and it is best to water with rain, snow or fermented rice washing water. If it is tap water, it should be left for 2 to 3 days before use. During the growing period, water or alum fertilizer containing 0.2% ferrous sulfate should be poured every 7 ~ 10 days. Gardenia should be placed in a cool place with scattered light in summer, and should be watered and sprayed frequently in spring, summer and early autumn to increase humidity. It is advisable to put sunshine in winter, stop fertilization and water too much. You can often wash the leaves with water close to room temperature to keep them clean, especially in rooms with heating in the north. Don't put the flowerpot in front of the radiator or air conditioner to avoid dehydration of the leaves.

Pest control: scale insects, red spiders and soot diseases occur in gardenia in summer when it is hot and poorly ventilated. 40% dimethoate EC 1000 times can be sprayed to control scale insects, 40% triamcinolone acetonide EC 1000 to 1500 times can be sprayed to control red spiders, and at the same time, the occurrence of soot disease can be reduced. For the sake of safety, washing powder solution can be sprayed at home, which also has certain effects.

5. Change the pot: Generally, the pot should be turned once every 65,438+0 to 2 years, preferably in spring. In order to effectively prevent the pot soil from alkalization, the pot can be turned once a year, and the pot button must be fastened before changing the pot. When the pot is slightly loose after drying, it is usually enough to stop pouring 10 days. When changing pots, cut off some roots, such as the roots of pests and diseases, over-breed the roots, and then plant them again.

6. Trimming: generally in spring, cut off the long branches, weak branches and other messy branches that affect the plant shape to keep the plant shape beautiful. Gardenia is the top flower, and the top core can be picked properly in the growing season to promote the growth of flower branches and increase the number of flowers.

7. Gardenia likes acidic soil, while the soil in the north is mostly neutral or alkaline, which leads to insufficient iron available to plants, which is one of the main reasons for the yellowing of gardenia leaves. Therefore, we should use fertile acid culture soil to cultivate gardenia. Generally, 4 parts of humus soil, 4 parts of garden soil and 2 parts of sandy soil can be prepared by mixing. Mix 1g-2g sulfur powder into each kilogram of culture soil, and it is best to water gardenia with rainwater or fermented rice washing water. During the growth period, apply 0.2% ferrous sulfate water every 18 to 15 days, or apply alum fertilizer water every 1 8 to 15 days (both can be done alternately). This can not only prevent the soil from becoming alkaline, but also supplement the soil with iron, thus preventing the leaves from turning yellow.

8. Gardenia likes to be wet. Usually, in addition to keeping the basin soil moist, we should always pay attention to increasing the air humidity. This is because the climate in the north is different from that in the south. In the north, it is dry in spring, often blowing dry wind, with strong light intensity in summer, hot weather and cold and dry climate in winter. Therefore, in spring and summer, we should spray leaves with clear water every morning and evening, and sprinkle water on the nearby ground to increase the air humidity. Water less in winter, but spray the leaves frequently to keep them clean.

9. Gardenia likes semi-shade, afraid of strong light, and the shading degree is about 50%. If exposed to the sun, the leaves will turn yellow and white until they fall off. Therefore, in summer, it should be placed under a shade shed or in a place where light is scattered, so that it can see more sunshine in the morning and evening to avoid the leaves from turning yellow.

10, gardenia likes fertilizer. When potted, in addition to changing pots and applying organic fertilizer as base fertilizer, topdressing is also applied in Qin Ying during the growth and development period, and thin fertilizer is suitable. In addition to alum fertilizer, quick-acting phosphate fertilizer, such as 0.5% calcium superphosphate, is applied 2 ~ 3 times after germination.

1 1, gardenia is not cold-tolerant, so pay attention to the appropriate time to enter and leave the room. Generally, it enters the room in the middle of 10. The room temperature should be kept at 10℃- 12℃, and the lowest temperature should not be lower than 0℃. It is not suitable to leave the house in early spring, usually in late April.