Cut off the rotten roots of a cactus with one slice, and it will root quickly in water.

Soil-grown cacti are rather peculiar; when grown in soil, they are very prone to root rot. Although cacti should not be watered too much, they can also be grown in water. A water-grown cactus lets you admire its tender white roots, and you can even keep a few small fish swimming among them, which is a delight to the eye.

1. Water culture of a cactus with rotten roots

A cactus with rotten roots can also be made to grow new roots through water culture. First, deal with the rotten roots: after digging out the ball, cut off all the rotten parts, then apply a little carbendazim, and put it in a ventilated place to dry for at least three to five days, until the wound is completely dry. The more water it lacks, the faster it will root.

Choose a water culture bottle of suitable size, add clean water and nutrient solution, and fix the cactus at the mouth of the bottle or in a planting basket. The nutrient solution should not touch the ball; a distance of about one or two cm from the ball is enough. This can prevent the cactus from rotting. After that, place it in a bright place for care. Before it has rooted, it is best to shade the transparent bottle so that only the ball is exposed to light.

2. Water culture of an ordinary cactus

Water culture of a cactus does not mean soaking the entire root system in water; instead, only the white tips at the lower end are placed in the water, while the rest of the roots remain exposed to the air. This ensures the roots have plenty of oxygen and prevents root rot from occurring.

Therefore, a water-grown cactus can be kept together with fish. This way you can observe its white roots and also keep a few small fish; you can enjoy both the fish and the flowers, giving it very high ornamental value.