Potted flowers and trees need to be changed after a certain period of time, otherwise the root system will be too much coiled in the pot, even if it is frequently fertilized and watered, it will not grow well. The time for changing pots varies according to the species and growth of the flowers and trees. Generally speaking, for fast-growing species, such as rose, hibiscus, poinsettia, winter jasmine, etc., change the pot once a year or two; for slower-growing species, such as cypress, orange, camellia, orchid, etc., just change the pot once every three to five years. There are usually two methods for changing pots:
1. Replace the original plant with the original pot. For example, hibiscus, poinsettia, etc., you can pour out the plants, plow the soil up and down under a layer of soil, and cut off the old roots and top tips, then replace with new soil, and plant the flowers and trees in the original pot. In this way, the stems of the plants are long and thick, and the crowns are not enlarged and tall, which is very suitable for cultivating bonsai.
2. Change the original plant to a larger pot. Such as camellia, citrus, etc., after pouring out the soil lumps, cut off some of the branches and carefully trim the root system. In addition to cutting off the rotten roots, you can also cut off some of the coiled roots, and pay attention to keeping the tap roots. After removing part of the old soil, use new soil to plant the original plant in a pot that is one-third larger than the original pot. This can make the trunk and canopy grow bigger and bigger, which is conducive to the growth of flowers.