Detailed Explanation of Finger Citron Cultivation Methods and Key Points

        Finger citron is commonly propagated by cuttings and grafting. Cuttings are best taken in early spring before new buds sprout, in combination with pruning. Select 1 to 2 healthy shoots cut from the plant, choose a 10-12 cm long stem section from the middle part as the cutting, insert it into sand or vermiculite, water thoroughly, cover with plastic film to retain moisture, and place in partial shade; at a temperature of 25°C, roots will form in about 1 month. For grafting, trifoliate orange or citron seedlings are commonly used as rootstock, usually by cleft grafting or approach grafting. Select scions from branches bearing flower buds; after grafting, they can bloom and bear fruit.        Cultivation Management        For soilless cultivation of finger citron, white plastic flower pots or ceramic flower pots are commonly used. For the soilless substrate, a mix of peat:perlite:sand = 4:4:2 or coconut fiber:vermiculite:ceramsite = 5:3:2 can be used. Potting is mostly done in early spring, with the specific operation method the same as for kumquat. After planting, immediately water thoroughly with nutrient solution, place in partial shade for 7-10 days, and after the seedlings recover, gradually move to a location with sufficient light for normal care. For regular liquid feeding, apply 1-2 times per week, 100-200 ml each time; for regular watering, keep the substrate alternately dry and moist.        Finger citron can bloom and set fruit multiple times a year, but some flowers are degenerate flowers that cannot be pollinated to set fruit. Generally, flower buds with an enlarged ovary in the middle-upper part of the inflorescence and a green flower center have a high fruit-setting rate, so more of these flowers should be retained. During the bud stage, spray the leaf surface 1-2 times with 0.2% potassium dihydrogen phosphate solution; after fruit set, spray 50 mg gibberellin or fruit-setting hormone, which can improve fruit set and promote fruit development. When the fruit grows to the size of a bean, appropriately thin out some young fruits according to the condition of the tree; this not only helps the fruit grow large and uniform but also helps bear fruit year after year. To prevent the occurrence of chlorosis, during the growing period it is advisable to water once every half month with 0.1% ferrous sulfate solution or alum fertilizer water to keep the substrate slightly acidic. After the Beginning of Autumn, gradually reduce the frequency of liquid feeding and watering. In northern regions, move indoors before Frost's Descent and place in a sunny spot, with room temperature preferably maintained at around 10°C. Each spring before budding, carry out one pruning, cutting off dead branches, thin and weak branches, diseased and pest-infested branches, and overly dense branches. The short branches of finger citron are mostly fruiting branches and should be retained as much as possible. Vigorous water shoots growing in summer can be cut back by 2/5 to encourage the growth of fruiting branches. Summer shoots in June-July should be appropriately removed, while autumn shoots should be appropriately retained to bear fruit the following year.        During the growth process, finger citron is often susceptible to pests and diseases such as anthracnose, sooty mold, citrus swallowtail butterfly, scale insects, and red spider mites, so timely prevention and control are needed.        For soilless cultivation of finger citron, kumquat nutrient solution can be used.