When is the latest blooming season for the Christmas cactus?
The Christmas cactus (Schlumbergera) is an epiphytic succulent plant of the genus Schlumbergera in the cactus family, native to the tropical rainforests of Brazil. Because in its place of origin it often grows epiphytically on large tree trunks or in dark, damp rock crevices, it requires shaded, humid environmental conditions for growth and development. It is a short-day plant, needing 8 to 10 hours of sunlight per day. Now let us take a look at when the Christmas cactus blooms!
When does the Christmas cactus bloom?
The Christmas cactus is divided into early-blooming, mid-blooming and late-blooming varieties according to how early or late the blooming season is. The blooming season runs from September to April of the following year. The flowers are borne singly at the tips of the branches and are rose red. The blooming season also varies depending on the region, but because of cultivation methods, some Christmas cacti are regulated to bloom in October. In countries such as Japan, Germany and the United States, the Christmas cactus has been produced on a large scale and has become one of the main indoor potted flowers in winter.
How do you regulate the blooming season of the Christmas cactus?
To make the Christmas cactus bloom earlier, it must receive 8 to 10 hours of sunlight per day, with complete darkness for the rest of the time, along with appropriate water control. After taking the above measures, it will generally bloom in 60 to 70 days. If you want it to bloom for National Day, you can start in mid-to-late July using a light-blocking black cloth cover or black plastic cover to shade the Christmas cactus, exposing it to light for only 8 hours a day and covering it with the black cloth cover the rest of the time. In this way it can bloom by late September. During the shading treatment, water once a day, keep the potting soil slightly moist, and pay attention to ventilation. To extend the blooming period of the Christmas cactus, after it blooms it should be placed in an environment of around 15°C. If you want to delay blooming, you can keep the potted plant under low-temperature conditions of 5 to 8°C or extend the light exposure to more than 14 hours a day.
Why does the Christmas cactus fail to bloom?
1. Too much light: The Christmas cactus is a short-day plant. When it receives more than 10 to 12 hours of light per day, it is difficult for flower buds to form. If there is ample light during the day and strong electric light at night, this will also affect bud formation and blooming.
2. Unsuitable room temperature: When the room temperature is too low, a Christmas cactus that has already formed buds will have difficulty blooming. At this time you can move the flowerpot into a greenhouse to maintain a temperature above 15°C, and after it blooms move it back to the original room for viewing.
3. Excessive temperature difference: When the temperature difference between day and night is too great, flower buds that have already formed will be damaged or drop. For this reason, from mid-October to mid-November, before bringing it indoors, it should be moved indoors in time to avoid sudden temperature changes. Normally, during the day let it get more sunlight outdoors to encourage more buds to form, and bring it indoors at night to prevent too great a temperature difference.
What should you do if the Christmas cactus does not bloom?
1. Apply less nitrogen fertilizer: If the Christmas cactus does not bloom, apply less nitrogen fertilizer. Fertilizers containing more nitrogen, such as horse hoof slices and ammonium sulfate, are indispensable for the normal growth of the Christmas cactus, but if applied in excess and with an insufficient supply of phosphorus and potassium fertilizer, they will make vegetative growth too vigorous and inhibit reproductive growth, and at this point the plant will be reluctant to bloom. Therefore, apply less nitrogen fertilizer.
2. Correct lighting: The Christmas cactus is a typical short-day plant. It can bloom smoothly only under light conditions with short days and long nights. Some growers like to place it near lights at night in winter. Because the light period is extended, flower bud differentiation is affected, so it is reluctant to bloom. The correct management method is to place them where the light is in sync with nature, that is, a place with light during the day and darkness at night.
3. Suitable temperature: In a low-temperature environment of around 15°C, flower bud development of the Christmas cactus is delayed, and at this time it is prone to the blind bud phenomenon in which flower buds die. In addition, if the ambient temperature drops to around 0°C, the flower buds will freeze to death. Maintain an ambient temperature of 15 to 20°C to ensure normal flower bud development.
4. Prune old plants: The flower buds of the Christmas cactus are borne at the tips of the leaf-like stems, so encouraging the growth of a large number of new leaf-like stems is the key to ensuring that the plant blooms normally. Every spring, it is best to combine repotting with cutting off some of the older Christmas cactus succulent stems, and carefully knock the plant out of the flowerpot, using a sharp knife to twist off a layer of old roots on the surface of the root ball to stimulate new root growth. In this way the plant's ability to absorb fertilizer increases, its growth vigor becomes stronger, and the flowers it produces are naturally more numerous.