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Gardenia cultivation and conservation:

Gardenia likes warm and humid climate, which is sunny but can't withstand strong sunlight. It is suitable for growing in loose, fertile, well-drained and slightly sticky acid soil, and is a typical acid flower. The suitable potting soil is 4% garden soil, 15% coarse sand, 3% manure soil and 15% humus soil.

attention should be paid to watering gardenia at seedling stage, keeping the soil moist and applying decomposed thin fertilizer frequently. It is better to water with rainwater or fermented rice washing water. If .2% ferrous sulfate water or alum fertilizer water is poured every 15 days during the growth period (the two can be used alternately), it can prevent the soil from turning alkaline, and at the same time, it can supplement iron to the soil to prevent the leaves of Gardenia from yellowing. In summer, Gardenia should spray water on the leaves every morning and evening to increase the humidity of the air and promote the luster of the leaves. Potted gardenia, after flowering in August, only water is poured, and the watering amount is controlled. Move indoors before the cold dew in October, and place it in the sunny place. Strictly control watering in winter, but you can often spray the leaves with clear water. From May to July every year, when the vigorous growth period of Gardenia will stop, the plants will be pruned to remove the top tips, so as to promote the sprouting of branches and make the plants beautiful and blossom more in the future.

Gardenia flowers are propagated by cutting and layering, and can also be propagated by dividing plants and sowing, but they are rarely used. Cutting can be divided into spring cutting and autumn cutting. Spring planting is carried out in the middle and late February; Autumn planting is carried out from late September to late October. The cuttings are selected for 2-3 years, cut into 1-12 cm pieces, leave two leaves on the top, cut off half of each, and then insert them obliquely into the bed, leaving only one section on the soil surface, paying attention to shading and maintaining a certain humidity. Generally, they can take root in one month and transplant after one year. In the south, there is also a method of propagation by water insertion, that is, the cuttings are inserted on a disc woven with reed stalks and allowed to float on the water, so that the lower part can take root in the water and then transplanted for cultivation. The layering can be carried out before and after the Qingming Festival in April or during the rainy season. Select one-year-old robust branches of three-year-old mother plants, pull them to the ground, and carve the buried parts on the branches. If 2ppm powder acetic acid can be dipped in the carved parts, and then cover them with soil for compaction, it will be easier to take root. Generally, a month can be separated from the mother plant after taking root, and then transplanted with soil in the next spring.

Gardenia is often prone to yellowing of leaves, which is caused by many reasons, so different measures should be taken to prevent it. Yellowing disease caused by lack of fertilizer: this yellowing disease starts from the old leaves at the lower part of the plant and gradually spreads to the new leaves. Nitrogen deficiency: the leaves are yellow and the new leaves are small and crisp. Potassium deficiency: Old leaves turn from green to brown. Phosphorus deficiency: Old leaves are purple or dark red. In the above situations, decomposed human excrement and urine or cake fertilizer can be forced to be applied.

chlorosis caused by iron deficiency: this chlorosis is manifested in new leaves. At first, the leaves are pale yellow or white, and the veins are still green. In severe cases, the veins are yellow or white, and eventually the leaves will dry up and die. This situation can be prevented by spraying .2%-.5% ferrous sulfate aqueous solution.

chlorosis caused by magnesium deficiency: this chlorosis gradually develops from old leaves to new leaves, and the veins are still green. In severe cases, the leaves fall off and die. This situation can be prevented by spraying .7%-.8% boron and magnesium fertilizer. Too much watering, freezing, etc., will also cause yellow leaves, so special attention should be paid in the maintenance process.

Gardenia jasminoides Ellis is prone to scale insect damage and soot disease when indoor ventilation is poor and temperature and humidity are too high in winter. Scale insects can be scraped off with bamboo sticks or sprayed with 2 times of water in 2 # petroleum emulsion. For soot disease, it can be scrubbed with clean water or sprayed with carbendazim 1 times solution.