The cultivation method of potted osmanthus
Plant knowledge series, sharing with you the planting content of woody flower osmanthus, the cultivation method of potted osmanthus, and the specific contents are as follows:
Osmanthus has always been a favorite tree species among flower enthusiasts, but many people are not very clear about the cultivation methods of potted osmanthus. Therefore, the editor has compiled and collected some basic knowledge about potted osmanthus for reference by flower enthusiasts.
Osmanthus is a light-loving tree species, slightly shade-tolerant, prefers warm and humid climate, does not tolerate severe cold and drought, prefers loose and fertile slightly acidic soil, and requires growth in sandy loam rich in humus and good drainage, with a pH value of 5.5-6.5 acidic soil being optimal. Alkaline soil is not suitable for planting and does not tolerate waterlogging. In dry and poor soil, growth is slow, leaves turn yellow, and it is not easy to bloom.
Potted Management
1). Watering: The potted osmanthus soil should follow the principle of not watering when not dry and watering thoroughly when watering, but water the leaves once a day with clean water, evenly wetting all branches and leaves until water droplets start to drip, to keep the leaves moist and clean dust adhered to the leaves. After Qingming Festival, move the osmanthus to an open-air location and water thoroughly. Water in the morning and evening in summer, and around noon in winter, to make the water temperature close to the soil temperature, avoiding sudden cold and heat, and be careful not to accumulate water. Keep the potting soil moist in winter.
2). Fertilization: Osmanthus is mainly for ornamental flowers and should be supplied with sufficient fertilizer. When shooting, apply 1-2 times of nitrogen fertilizer to promote the growth of branches and leaves; before bud differentiation and flowering, apply phosphorus fertilizer mainly. After moving the osmanthus to an open-air location in spring, start watering with decomposed thin soybean cake, sesame paste, and fishy water, once every half month, and once a week from the end of May to before flowering, gradually increasing the concentration of fertilizer water. Every half month from July to August, apply a 0.5% monopotassium phosphate solution. After flowering, apply a light fertilizer solution to avoid causing autumn branches. In winter, apply more organic fertilizer and phosphorus-potassium fertilizer, generally applying decomposed and odorless cake fertilizer 25-30 grams and monopotassium phosphate 10-15 grams to the roots every 15-20 days, diluted with 2-3 kilograms of clear water, and spray 1000 times of nucleotide and 600 times of high-efficiency bio-phosphorus-potassium fertilizer mixture on the leaves every 10-15 days. Before fertilizing, the potting soil should be slightly dry, and the soil should be loosened first to facilitate fertilizer absorption. Water the next day after fertilizing. If using compost or manure, it must be fully decomposed (indicated by black fertilizer juice). The concentration of chemical fertilizer superphosphate should not exceed 2%, and urea concentration is 0.5-1.0%.
3). Repotting: Potted osmanthus should be repotted and changed every 2-3 years. Cut off some old and withered roots and remove some of the old soil with a bamboo stick. Before potting, place a layer of river sand or vermiculite at the bottom of the pot for ventilation and drainage, and place decomposed cake fertilizer as a base fertilizer at the bottom of the pot. The soil must be compacted to promote the flowering and lush growth of osmanthus. The soil mixture for potted osmanthus is not very strict, usually a mixture of garden soil, compost, and river sand each accounting for 1/3. If the acidity is too high, add some lime powder or wood ash; if the alkalinity is too heavy, add some aluminum sulfate or iron sulfate. In spring, after planting the potted osmanthus, water thoroughly and then move it to a shaded area for about 10 days to "settle in." During this period, do not apply fertilizer. Only after the plant recovers and grows new leaves can watering and fertilization resume. The quality of the pot should be purple sandstone or glazed pottery, with purple or ochre color being better, creating a contrasting effect with the flowers and leaves to enhance its ornamental value.
4). Pruning and Shaping: The best shapes for osmanthus are curved trunk, slanted trunk, or flowing style. With a slanting posture, dense branches and leaves, and a simple and natural appearance, it is most appreciated. When in bloom, the fragrance is rich and refreshing. Pruning and shaping of osmanthus usually combines tying and pruning methods, with the main trunk tied into a curved or slanted shape. Pruning and shaping of osmanthus should be done after autumn. For plants with very tall lower branches that are empty and have poor tree shapes, cut the top branches at 2/3 or 3/4, and for plants with "top-heavy" branches, cut the dense upper branches, leaving only the smaller lower branches. For dense plants, thinning should be done. After flowering, another pruning should be carried out to remove vigorous branches, withered branches, diseased branches, and dense weak branches.
5). Overwintering: Room temperature should be maintained between 0-5°C, and relative humidity should be kept between 50-80%. In the cold room during winter, the light should be good, especially before the early spring sprouts start to germinate, which requires ample sunlight. In the following spring, after Guyu (Jingzhe in the Huaihe River Valley) in North China, arrange the potted osmanthus to go outdoors. After going outdoors, first gather them in a sunny and windward area, and then scatter them in rows to gradually adapt to the external environment.
6). Disease and Pest Control: Common diseases of osmanthus include leaf spot, sooty mold, algal spot, root rot, and iron deficiency, which should be treated according to the disease situation. Leaf spot, sooty mold, and algal spot can be controlled by spraying 0.5 Bordeaux mixture or 5% carbendazim 500-1000 times solution. For root rot, pay attention to keeping the soil loose and ventilated and not waterlogged. If root rot is caused by fungi, apply 200-300 times of zinc omethoate solution to the roots. Common pests of osmanthus include leaf bees, whiteflies, mites, long white scale insects, and yellow刺蛾. Leaf bees, whiteflies, and mites can be controlled by spraying 40% dimethoate 1500-3000 times solution. For long white scale insects, in addition to manual removal, apply 40% omethoate 1000 times solution or 40% fenvalerate 500 times solution during the first and second instars.
The above is a detailed introduction to the cultivation method of potted osmanthus, have you understood it?