Grandpa's old stump after years of growing gets repotted and root-washed, hung up like an octopus

Grandpa loves growing flowers very much. Ever since he retired, he has been growing flowers in his yard at home, all kinds of flowers - orchids, clivia, jade plants and so on. Later he took a liking to desert roses, and the more he grew, the more he had, and he expanded the growing area. Today I will share his experience growing desert roses.
The desert roses Grandpa grows are called tree spirits by the neighbors. Basically every pot is nearly 1 m tall, and they have all been grown for many years, with graceful shapes and well-developed root systems, just like this pot. At first I thought he was watering it, but then I realized he was washing the roots of the desert rose. The purpose of washing the roots was to repot it, but because the plant's root system is so well developed, lifting the pot out directly would do greater harm to the plant, so the soil was washed off first.
Because the whole plant is simply too large, it is too difficult to handle, so it could only be hung up directly to wash off the soil, and then repotted with new soil. After seeing the root system once it was taken out of the pot, I was truly amazed - the desert rose's root system is really so well developed, a real "octopus."
Actually, desert roses are fairly easy flowers to grow. For ordinary flower enthusiasts, it is recommended to grow small ones, because larger plants are more difficult to manage, so it is suggested that you just grow them as you like. When growing desert roses, pay attention to the following 3 points:
1. Desert roses like loose soil. When choosing soil, it is best to choose sandy soil, as this increases the air permeability of the root system and is also an effective way to prevent root rot.
2. With such thick and sturdy roots, fertilizing must be timely and sufficient. Generally in summer, apply monopotassium phosphate once a week; potassium fertilizer can promote plant root growth. Each spring, fertilize mainly with compound fertilizer.
3. Prune regularly to remove apical dominance. Desert roses also need regular pruning. Basically, from spring to autumn every year, they need continuous pruning. The benefit of pruning is that it can control a graceful plant shape, and after removing apical dominance, it can also promote the growth of the plant's root system.