Gardenia leaves often turn yellow during their growth, mostly due to improper cultivation and management. Too much or too little water, too much or too little sunlight, too much or too little fertilizer can cause yellowing of leaves, but the yellowing situation is different, and the reasons should be carefully observed and analyzed to correct them.

Water yellow: The young leaves are dark yellow and dull, the old leaves have no obvious changes, the branches are small and yellow-green, and the new shoots shrink and do not grow, indicating excessive watering. Remove the flowers from their pots and place them in a ventilated, cool place where the soil will dry and then put them back into the pots.

Drought yellow, water-deficient yellow is different from water-rich yellow. Water-deficient yellow means that the leaf tips or edges become dry and dry. The old leaves wither and turn yellow and fall off from bottom to top, but the new leaves grow more slowly. normal. Pay attention to watering enough and thoroughly.

Scorching yellow: Strong sunlight shining directly on some shade-loving flowers (such as spider plants, hostas, etc.) can easily cause the leaf tips and leaf edges of the flowers to wither, and yellow spots to appear on the sunny parts of the leaves. Just move it to a shaded place.

Light-deficient yellow: If the leaves are placed in a shaded environment for a long time, the leaves will not get enough sunlight and cannot form chlorophyll. The entire leaves will turn yellow and then fall off. This disease can be avoided by supplementing the light.

Fat yellowing: yellowing of flowers caused by excessive fertilization or excessive concentration, which is manifested in the appearance of dry brown at the tips of new leaves. Generally, the leaves are thick and dull, and the unevenness is not stretched, and the old leaves are brown and fall off. Fertilization should be stopped immediately, and part of the fertilizer should be rinsed with a large amount of water if necessary.

Fat-deficiency yellow is manifested in that the young leaves become lighter in color and appear yellow or light green, while the old leaves are relatively normal or gradually turn from green to yellow. Check the pot soil. If it is dry, replace the soil. Apply thin fertilizer frequently and pour some alum water in a timely manner.

Cultivation of Gardenia

1. Soil: Gardenia is an indicator plant of acidic soil, so the slightly acidic environment of the soil is the key to determining the growth of gardenia. . The culture soil should be a mixture of 70% slightly acidic sandy red soil and 30% leaf humus. It is appropriate to control the soil pH value between 4.0-6.5.

2. Temperature: The optimal growth temperature of gardenia is 16℃-18℃. Low temperature and direct sunlight are extremely detrimental to its growth. Therefore, in summer, gardenias should be maintained under a sparse forest or shade shed with good ventilation, high air humidity and light transmission. In winter, put it in an environment where it can see sunlight and the temperature is not lower than 0℃, and let it sleep. Too high temperature will affect the flowering in the next year.

3. Water: Gardenia likes moist air, so watering should be increased appropriately during the growth period. Usually when the potting soil turns white, water it thoroughly. Summer is hot and dry, so spray the leaves 2-3 times a day to increase air humidity and help the plants cool down. But after the flowers bud, watering should not be too much to avoid causing buds to fall. It is better to water on the dry side in winter to prevent water damage and root rot.

4. Fertilizer: Gardenia is a plant that likes fertilizer. In order to meet its demand for fertilizer during the growth period and maintain a slightly acidic environment in the soil, ferrous sulfate can be mixed into the fertilizer solution in advance. Fermentation. After entering the peak growth season in April, topdressing can be done every half month (it is best to add more water when fertilizing to prevent burning of flowers). This can not only meet the gardenia's demand for fertilizer, but also keep the soil environment in a relatively balanced slightly acidic environment to prevent the occurrence of yellowing disease. harm.

5. Propagation: Although there are many ways to propagate gardenias, the easiest and fastest is the floating water planting method. First, find a foam board, drill holes in it, and place the gardenias Cut off the half-ripe branches of the current year and insert them into the holes of the foam board. Then put the foam board into a bucket filled with water. Place the bucket in an environment that can both shade the driftwood strips and allow sunlight to shine on the bucket. If the water temperature is controlled between 18°C ??and 25°C, gardenias can grow roots of more than 3 cm in one week. This method is used to cut gardenias, and the survival rate is 100%.

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Just stick it in the soil or water. Gardenia has a strong vitality

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Gardenia, also known as Linlan, Mudan, Yuetao, etc. It belongs to the Rubiaceae family and is an evergreen shrub. Branchlets green. Ripe in October. Flowers from May to July. Gardenia is native to southern my country and has been widely cultivated as early as the Han and Tang Dynasties. It is now grown everywhere. Nature likes a warm and humid climate, is more tolerant of shade, and intolerant of severe cold.

Gardenia should be repotted from April to May every year. The pot soil can be mixed with alum fertilizer water residue, sand, fine slag ash, and leaf mold soil. The suitable temperature for growth is 20℃-28℃. When the weather is hot from late spring to early autumn, pay attention to shade, high temperature, direct sunlight and stale air circulation. Otherwise the leaves will turn yellow.

1. Soil: It is advisable to use humus-rich and fertile acidic soil for cultivation. This is the key to successful cultivation in northern families. Generally, you can use rotten leaf soil plus 1 part of decomposed bean cake fertilizer, and mix in a certain amount of ferrous sulfate at the same time, or drench it with 0.2% ferrous sulfate or alum fertilizer water 3 to 5 times after potting.

2. Cultivation: Use cuttings and layered seedlings for planting. Make sure that the root system of the plant is fully stretched. At the same time, fill the gaps in the root system with fine soil. The density of the filled soil is about 85%. And pay attention to tightening at the bottom and loosening at the top. The depth should be about 1 cm above the root system. Water thoroughly after planting. Generally, water seepage from the bottom of the pot is appropriate.

3. Management and maintenance: Gardenias require relatively high air humidity. Northern families can put water in a pot pad and place a thin plate (about 3 cm) side by side. The water in the pot should not cover the thin plate. It is advisable to put the flowerpot on a thin board, and be sure to add water frequently.

The principle of watering is to dry it thoroughly and water it thoroughly. It is better to use rainwater, snow water or fermented rice water. If it is tap water, it should be left for 2 to 3 days before use. During the growth period, water containing 0.2% ferrous sulfate or apply alum fertilizer every 7 to 10 days. Gardenias should be maintained in a place with scattered light under the shade of trees in summer. Water and spray the leaves frequently in spring, summer and early autumn to increase humidity. In winter, it is advisable to place it in a sunny place, stop fertilizing, and do not water too much. You can often water the branches and leaves with water close to room temperature to keep the leaf surface clean, especially in rooms with heating in the north. Do not place the flowerpot in front of a radiator or air conditioner to avoid dehydration of the leaves.

4. Prevention and control of pests and diseases: Scale insects, red spider mites and sooty diseases are likely to occur in gardenias during high temperatures and poor ventilation in summer. You can spray 40% dimethoate EC 1000 times to prevent scale insects, and 40% dicofol EC 1000 to 1500 times to prevent red spider mites. It can also reduce the occurrence of sooty disease. For the sake of safety, you can use liquid laundry detergent at home. Spraying also has a certain effect.

5. Repotting: Generally repotting is done once every 1 to 2 years, preferably in spring. In order to effectively prevent alkalinization of the pot soil, repotting can be performed once a year. The pot must be buckled before repotting. Buckling the pot is done when the pot is slightly loose after it dries. Generally, it is enough to stop watering for about 10 days. When repotting, cut off some of the roots, such as diseased and insect-infested roots, and over-populate the roots before planting.

6. Shaping and pruning: Generally done in spring, cut off overly long branches, weak branches and other random branches that affect the shape of the plant to maintain a beautiful shape. Gardenia flowers bloom at the top, and top topping can be done appropriately during the growing season to promote the growth of flower branches and increase the number of flowers.

7. Gardenia prefers acidic soil, while the soil in the north is mostly neutral or alkaline, resulting in a lack of iron in the soil for plants to utilize. This is the main reason for the yellowing of gardenia leaves. One of the reasons. Therefore, fertile acidic culture soil should be used to cultivate gardenias. Generally, it can be mixed with 4 parts of leaf mold soil, 4 parts of garden soil and 2 parts of sandy soil. Mix 1 to 2 grams of sulfur powder per kilogram of culture soil. It is best to use rainwater or fermented rice water to water gardenias. During the growth period, apply 0.2% ferrous sulfate water once every 10 days to 15 days, or apply alum fertilizer water once every 10 days - 15 days (the two can be done alternately). This will not only prevent the soil from becoming alkaline, but also add iron to the soil, thereby preventing the leaves from turning yellow.

8. Gardenia likes moisture. In addition to keeping the pot soil moist, you must also always pay attention to increasing the air humidity. This is because the climate in the north is different from that in the south. The north has dry springs, frequent dry winds, high light intensity and hot weather in summer, while the winter climate is cold and dry. Therefore, in spring and summer, spray the leaves with clean water every morning and evening and sprinkle water on the nearby ground to increase the air humidity. Watering should be less in winter, but you still need to spray the branches and leaves frequently to keep the leaves clean.

9. Gardenia likes half shade and is afraid of strong light exposure, so it needs about 50% shade. If exposed to the sun, the leaves tend to turn yellow, turn white, and fall off. Therefore, in summer, it must be cultivated under a shade shed or in a place with scattered light, so that it can see more sunlight in the morning and evening to prevent the leaves from turning yellow.

10. Gardenia likes fertilizer. When potting, in addition to applying organic fertilizer as base fertilizer in conjunction with changing pots, top dressing should also be applied frequently during growth and development. Thin fertilizer is appropriate. In addition to frequent application of alum fertilizer and water. , add 2 to 3 times of quick-acting phosphate fertilizer after budding, such as 0.5% superphosphate, etc.

11. Gardenia is not cold-tolerant, so pay attention to entering and leaving the house at the right time. Generally, it is advisable to enter the room in mid-October, and the room temperature should be kept at 10℃-12℃, and the minimum should not be lower than 0℃. It is not advisable to leave the house too early in spring. It is usually better to leave the house in late April.