How to Grow a Cactus (Cereus/Cereus validus)? A Complete Guide to the Latest Cultivation Methods
The Cactus (Cereus validus) is also known as "Shanying" (Mountain Shadow) or "Xianrenshan" (Immortal Mountain), among other names. Its form resembles a mountain yet is not a mountain, resembles stone yet is not stone. It is a living, lush, layered, year-round green succulent plant of the Cactus family (Cactaceae), genus Cereus. Although it is a plant, it expresses the artistic conception of a mountain-stone bonsai, used to decorate halls, desks and other places, elegant and refined, with a unique effect. Now let us take a look at the cultivation methods for the Cactus (Cereus validus)!
Growth Habits of the Cactus (Cereus validus)
The Cactus (Cereus validus) is native to the West Indies, northern South America and eastern Argentina, and is now widely grown in various places. For pot cultivation, choose an air-permeable, well-draining, lime-rich sandy soil. It is robust, preferring well-draining, moderately barren sandy loam. In winter it can tolerate low temperatures of 5 degrees. It is not suited to overly moist soil or environments with too little light.
Propagation Methods of the Cactus (Cereus validus)
The Cactus (Cereus validus), like other cactus plants, is very easy to propagate and grow. It is usually propagated by cuttings, which can be done throughout the year, with April to May being the best time. Select a small modified stem of the Cactus (Cereus validus), cut it off and let it dry for 1 to 2 days. After the cut surface has dried, insert it into the soil. Do not water for the time being; press the soil firm and cover it, and spray some water to keep it moist. Generally, under suitable temperature conditions (14 to 23°C), roots will form in about 20 days and it can then be transplanted. Cuttings taken during the plum rain season and the hot summer days have a lower survival rate.
Cultivation Methods for the Cactus (Cereus validus)
1. Light: The Cactus (Cereus validus) likes sunlight, is drought-tolerant, barren-tolerant, and also shade-tolerant. For pot cultivation, choose an air-permeable, well-draining, lime-rich sandy soil.
2. Soil: The Cactus (Cereus validus) is not suited to overly moist soil or environments with too little light. Water sparingly rather than generously; water once every 3 to 5 days to keep the soil slightly dry. This makes the plant grow slowly, thick and plump, with a beautiful shape.
3. Watering: Watering the Cactus (Cereus validus) should follow the principle of “alternating dry and wet”, preferring dry over wet. There can be no absolute fixed interval for watering; it must be flexibly adjusted according to weather, temperature, light, ventilation and other factors. The Cactus (Cereus validus) must be restricted in water and fertilizer, otherwise it easily develops root rot, or grows leggy and deformed, showing a “reversion“ phenomenon, growing into a columnar shape and losing its ornamental value.
4. Fertilizing: The Cactus (Cereus validus) generally does not need fertilizing. Each year when repotting, place a small amount of bone meal and organic fertilizer at the bottom of the pot as a base fertilizer. Never apply high-concentration chemical fertilizers, otherwise fertilizer burn will occur and the loss will outweigh the gain. You can also use organic fertilizers such as sesame paste residue to make liquid fertilizer, dilute it and pour it onto the potting soil.
5. Spring and Autumn: Spring and autumn are the peak growing seasons for the Cactus (Cereus validus). Fertilizer and water management follows the cycle of Flower Treasure → clear water → Flower Treasure → clear water, with an interval of about 2 to 4 days for outdoor cultivation; shorter intervals during sunny or high-temperature periods, longer intervals or no watering during rainy or low-temperature periods; 3 to 6 days for indoor cultivation.
6. Summer: During the high-temperature period in summer, the Cactus (Cereus validus) often enters a dormant state and has little demand for fertilizer and water, and even requires restricted fertilizer and water. Fertilizer and water management follows the cycle of Flower Treasure → clear water → clear water → Flower Treasure → clear water → clear water, with an interval of about 3 to 5 days for outdoor cultivation. Try to water in the morning or evening when temperatures are lower. Also mist the plant frequently.
7. Winter: When overwintering the Cactus (Cereus validus), move it indoors promptly when the outdoor ambient temperature drops below 5°C, place it in a sunny spot, and maintain room temperature between 5 and 10°C for safe overwintering. If the temperature drops suddenly, you can cover it with a plastic bag to keep it warm.
8. Pests and Diseases: The Cactus (Cereus validus) rarely suffers from pests and diseases. Under dry, stuffy conditions with poor ventilation, it is prone to red spider mites, so take care to prevent and control them. You can spray with a liquid pesticide, or use a knife to dig out the affected part so that new modified stems grow again, though this will damage the beauty of the original form.