Osmanthus is a long-day plant that likes to grow in sufficient sunlight and in places with rich soil and good drainage. The soil should be slightly acidic, with a pH of 5.5 to 6.5. Avoid alkaline soil, fear of water accumulation and soot.

(1) Open-field cultivation: Osmanthus fragrans is cultivated more often in early spring. The planting site should choose a place with sufficient sunshine, good drainage and deep soil.

Before planting, dig a big hole, apply more organic fertilizer, and add some plant ash. The seedlings need to be transplanted with soil ropes to facilitate their survival. Water thoroughly after planting.

Apply liquid fertilizer once after growth. Apply water and fertilizer 1-2 times between July and August. Apply well-rotted compost before winter. From now on, quick-acting nitrogen fertilizer will be applied in late March every year, quick-acting phosphorus and potassium fertilizer will be applied in July, and organic fertilizer will be applied again in October. After each fertilization, timely irrigation, cultivating and weeding are required. Pay attention to timely prevention and control of pests and diseases, so as to accelerate growth, bloom luxuriantly and have more fragrant flowers every year.

(2) Potted Plants To make sweet-scented osmanthus bloom more and smell fragrant, you need to grasp the five main steps of selecting the pot soil, watering at the right time, applying top dressing skillfully, pruning appropriately, and controlling diseases and pests. Pot soil selection: The culture soil can be prepared with mountain mud, humus soil, and sandy soil in a ratio of 5:3:2, or it can also be prepared with half and half humus soil and sandy loam soil. Watering: The principle of "two less and one more" should be followed when watering sweet-scented osmanthus, that is, less watering before new shoots appear, less watering in rainy days, and more watering in dry weather in summer and autumn. It is advisable to water the pot regularly to keep the pot soil half dry and half wet. On rainy days, shelter and drainage should be provided in time to prevent water accumulation in the basin from causing root rot. Don't water too much in winter, otherwise it will easily cause leaves to fall or even die due to waterlogging. Generally speaking, "don't water if it's not dry, water it thoroughly." Fertilization: Apply fully decomposed cake fertilizer and water every 10 days after germination in spring to promote branch growth. After July, apply liquid fertilizer mainly composed of phosphate fertilizer to promote flower bud differentiation. If there is insufficient fertilization, especially insufficient phosphate fertilizer, there will be few branches, few flowers, and insufficient fragrance. Before entering the house in winter, you can sprinkle bean cake powder on the surface of the pot soil or pour concentrated fertilizer once to survive the winter. Pruning: Osmanthus fragrans has a well-developed root system and strong germination ability. Therefore, to make the sweet-scented osmanthus flourish, it needs to be pruned appropriately to maintain a balance between reproductive growth and vegetative growth. Generally, leggy branches, thin branches, and diseased and insect-infected branches should be cut off to facilitate ventilation and concentration of nutrients, so that Osmanthus fragrans can breed more and fuller flower buds.

Cultivated varieties can be propagated by sowing, grafting, cuttings or layering; seeds have a post-maturity period and need to be stored in sand for about half a year before sowing. Cuttings are carried out before germination in the spring. Select annual branches as cuttings, insert them into plain sand soil or peat soil, cover them with plastic film, and place them in a shaded place for maintenance. They can take root after the beginning of autumn. When propagating seedlings in large quantities, small-leaf Ligustrum lucidum is often used in the north, while large-leaf Ligustrum lucidum biennial seedlings are often used as rootstocks in the south. Before germination in spring, they are cut off 5 cm above the ground and then grafted using the cutting grafting method. Potted osmanthus in the north is mostly propagated by docking before the summer solstice. In early spring, first plant the small-leaf ligustrum in a pot, and then connect it to the branches of similar thickness on the sweet-scented osmanthus tree. Cut the scion away from the mother body before and after the white dew, and at the same time, cut off the branches above the rootstock interface.

Osmanthus prefers a warm, dry environment with plenty of sunshine and fertile, well-drained, slightly acidic soil. Potted osmanthus needs to change the soil once every spring before it sprouts. At the same time, the overly dense and aging fibrous roots should be properly pruned. From April to September, it should be cultivated in a ventilated and sunny place, and watering should be done first and then wet. Avoid overwatering or water accumulation in the basin after rain. During the flowering season, watering should not be too much. Otherwise, it will easily cause bud drop.

Osmanthus likes fertilizer. Apply decomposed thin liquid fertilizer every 7 to 10 days during the growing season. Apply dry fertilizer once before and after flowering (about 50 grams of sauce residue per pot).

Applying before flowering can promote luxuriant flowering; applying after flowering can promote the growth of new branches in the coming year. Osmanthus is a fragrant flower and tree that likes fertilizers containing phosphorus and potassium. Therefore, during the entire growth period, fertilizers containing more phosphorus and potassium should be applied appropriately. In late autumn, it needs to be moved to a cold room above 0℃ to overwinter, and the pot soil should be kept slightly moist to make it fully dormant, which is beneficial to flowering in the next year.

Osmanthus likes sunshine and dryness, and is evergreen all year round. With proper management, the osmanthus bonsai can have luxuriant branches and leaves, bloom continuously year after year, and the flowers are fragrant.

1. Repotting When the plant is 50 cm tall, a 24 cm diameter flower pot is generally used; when the plant is 80 cm tall, a 32 cm diameter flower pot is used. When changing to a large flower pot, it can be replaced every 3-5 years. Prepare nutrient soil before changing the pot. The nutrient soil should be mixed with half and half humus soil and garden soil and set aside for later use. When changing pots, retain 40% of the old soil, cut off rotten roots, and appropriately trim old roots around the soil lump and a small amount of coiled fibrous roots. After changing the pot, add an appropriate amount of new soil and water it enough. Place it in a cool place for 10 days before moving it to a balcony or courtyard with sufficient sunlight and good ventilation. Repotting should be done in early March.

2. Fertilizer and water management. Due to the limited capacity of potted osmanthus, it is easy to lack nutrients and water, so it needs to be supplemented by fertilization and watering. Top dressing should be carried out during the growing season. In the year of repotting, from June onwards, apply 15% decomposed pig manure and a fertilizer solution soaked in tung bran, or 15% tung bran and tung bran in combination with watering every 20 days. For liquid fertilizer soaked in compound fertilizer, fertilization should be stopped in early October. The following year, when the plants grow new leaves, 15% of the above liquid fertilizer is poured every 15 days starting from April; the concentration of liquid fertilizer is increased to 20%-30% from June to August.

If the growth is strong, the frequency of fertilization and the concentration of liquid fertilizer should be reduced; from September to October, 15% of the above liquid fertilizer should be applied once every 20 days, and fertilization should be stopped after frost. After each application of fertilizer, water should be watered in a timely manner and the frequency of watering should be flexibly controlled according to the climate and growth conditions, depending on the dryness and humidity of the pot soil. It is appropriate to keep the pot soil humidity in a semi-dry state. Generally, watering is done once every 2-4 days in spring and autumn, and once every 1-3 days in summer. Pay attention to watering more when the weather is sunny and dry, and water less or not at all on cloudy or rainy days. Osmanthus should avoid getting wet, and water should not accumulate in the basin, especially during the flowering season in autumn. Excessive humidity will cause the flowers to fall.

3. Pruning Pruning is mainly winter pruning and is carried out every year in early spring. During the first winter pruning, according to the size, height, plant shape, etc. of the seedlings, shorten the main trunk by 1/4-1/3 to encourage the lower adventitious buds to sprout new branches, and prune the dense branches appropriately. For subsequent pruning, first cut off dead branches, thin branches, diseased and insect-infested branches, and then retain 3-5 lateral branches with short internodes, moderate opening angles, and even spatial distribution, and thin out the remaining sprouting tillering branches. When pruning the following year, for the side branches that have grown too vigorously, keep some branches at the base to make flower branches, then cut the long parts short so that they can grow in harmony with other side branches. At the same time, cut off the leggy branches that grow in summer and autumn, and control them as needed. Plant height, combined with topping and hanging lower branches, can form a good crown structure.

4. Disease and Pest Control If there are gray-white dots on the branches of Osmanthus fragrans, they can be removed with a brush, or sprayed with 1500-2000 times of Dimethoate EC, once every 7 days, and sprayed 3 times in a row.

The most critical factor for the survival of Osmanthus fragrans transplantation is water. Therefore, everything in transplantation must revolve around the conditions required by Osmanthus fragrans.

1. Digging soil balls: The diameter of the soil balls excavated during transplantation should be about ten times the diameter at breast height of the tree. The attempt should be based on the diameter at breast height of the tree. The dug soil balls should be wrapped with packaging materials to avoid The soil ball is loose.

2. Pruning: Because Osmanthus fragrans grows slowly, it is necessary to retain as many backbone branches as possible when transplanting. On the premise of ensuring a complete crown skeleton, all branches and leaves grown in the last growing season should be removed. Remove some parts, and at the same time remove diseased branches, weak branches, residual branches, ingrown branches and leggy branches. Do not remove all branches and leaves and leave only the trunk. Because after the sweet-scented osmanthus tree has its shoots and leaves cut off, it is difficult for new shoots and leaves to germinate.

3. Base fertilizer: Osmanthus is a tree that likes fertilizer. When planting, sufficient base fertilizer should be applied. The base fertilizer should be decomposed organic matter fertilizer, such as compost. The surface of the soil ball for osmanthus planting should be flush with the ground. If the planting area is prone to water accumulation, the soil ball should be higher than the ground when planting.

4. Watering: The key to the survival of Osmanthus planting is watering. Immediately after planting, the root water should be poured, and the water must be poured enough. After that, the above-ground part of the seedlings should be sprayed with water two to three times a day. It depends on the weather, but avoid watering the roots of the sweet-scented osmanthus every day. Generally, except for enough root water when planting, watering once a week will suffice, but it must be thoroughly soaked.

5. Planting time: The best planting season for sweet-scented osmanthus is before and after the new branches sprout and after flowering in autumn, that is, from February to May and October to November every year. If you really want to transplant during the high temperature and drought season, you must add corresponding shading facilities after transplantation and increase the number of water sprays on the branches and leaves every day.