What are the reasons why the Christmas cactus (Schlumbergera) does not bloom?
Not enough time
The Christmas cactus will bloom, but generally only 2 to 3 years after grafting. So after grafting, care should be taken with its maintenance, and it can only bloom once the time comes. During the first 2 to 3 years, simply take good care of it.
Improper lighting
Light is also a very important condition for the Christmas cactus to bloom. For cacti, short-day conditions are needed for good blooming. There must be suitable sunlight, and the duration must be neither too short nor too long. The Christmas cactus needs to be in a dark environment for more than 12 hours every day, so some shading treatment is required, otherwise blooming will also be affected.
Generally speaking, the above two reasons account for most cases of the Christmas cactus not blooming, though there can still be other reasons, which we will not introduce one by one. Next, we will explain in detail the care methods for the Christmas cactus.
How to grow the Christmas cactus and points to note - Why the Christmas cactus does not bloom
Among cacti there are some unique varieties that look somewhat different from cacti in the usual sense, yet are indeed covered in spines and have a certain cactus feel. So people, combining this unique cactus with some of its appearance features, created a new name for it.
How to grow the Christmas cactus
1. Temperature: The Christmas cactus likes warmth, and the suitable growing temperature is 15-25°C. It is not cold-tolerant, and the overwintering temperature is best above 51°C. At 20°C growth is slow, and at 15°C growth stops. In winter, when temperatures are low, the plant is prone to cold damage, which causes grafted Christmas cactus plants to drop flowers in large numbers.
2. Light: The Christmas cactus likes partial shade and avoids direct strong sunlight. Too strong light will make the plant turn yellow and withered, with shriveled stems and leaves. From May to September, shading should be provided, and the rest of the time it needs plenty of sunlight. The formation and development of flower buds require a continuous dark environment of 12-14 hours per day. During flower bud differentiation and bud formation, there should not be overly bright light at night, otherwise bud formation and blooming will be affected. During blooming, appropriate shading can extend the flowering time.
3. Watering: The Christmas cactus is relatively drought-tolerant and averse to waterlogging. During the spring and autumn growing periods, water should be supplied fully to keep the potting soil moist, but do not water too much, otherwise the plant is prone to root rot. During blooming, the potting soil should be moist but on the drier side; watering too much and making the potting soil too wet will cause flower buds to wither and drop. During the dormant period after blooming and the summer semi-dormant period, watering should be controlled and rain exposure prevented; too much watering or rain exposure in summer will both cause root rot in the plant.
4. Fertilizing: The Christmas cactus does not like heavy feeding, but because it produces many buds and flowers, it needs to consume a large amount of nutrients, so sufficient nutrients must be given for it to bloom normally. When the plant begins to grow in spring, apply a nitrogen-based fertilizer once every 10 days to make the emerging leaf-like stems thick and plump. In autumn, when flower buds begin to differentiate, apply a phosphorus-based fertilizer once every 7-10 days to promote flower bud differentiation and flower bud growth; insufficient nutrients often causes bud and flower drop. Fertilizer should be stopped during winter dormancy and summer semi-dormancy.
5. Pruning: In spring, prune the Christmas cactus once along with repotting, thinning out overly dense branches and shortening the remaining branches. Cutting off the front sections of the leaf-like stems benefits leaf emergence after growth and strengthens the plant's growth vigor. After buds appear, if there are too many buds, thin them out, generally keeping 1 bud per leaf-like stem.
6. Repotting: Repot the Christmas cactus once every 2 years, preferably after flowering and before bud growth begins, combined with pruning. It likes fertile soil with good drainage and aeration; the growing medium can be prepared from materials such as leaf mold, peat soil, and rice husk ash. When potting, trim off dead roots and overly long old roots, and wait for the roots to dry before planting it in the pot.
Points to note when growing the Christmas cactus
1. Control moisture
In winter it needs to go through a stage of being chilled and going dormant, otherwise it is very difficult to bloom. After being chilled, it needs to stay dry until it is about to bloom, and no watering is needed during this period.
After entering spring, still do not water; wait until the flower buds are the size of a soybean, then begin to water thoroughly. This can promote more flower buds in the Christmas cactus and benefit blooming.
After the Christmas cactus blooms, and during the dormant period under high summer temperatures, moisture must be controlled while also preventing rain exposure, to avoid root rot.
2. Repotting and pruning
Repot once every 2 years; the growing medium can be prepared from materials such as leaf mold, peat soil, and rice husk ash. In spring, carry out pruning along with repotting, thinning out overly dense branches and shortening the remaining branches. After pruning, spray with lime sulfur mixture to reduce spring disease damage.
Why the Christmas cactus does not bloom
1. The Christmas cactus does not bloom because not enough time has passed
The Christmas cactus will bloom. Generally, cacti that are propagated by cuttings or grafting need 2——3 years of growing before they may bloom. So when growing the Christmas cactus, if it has not been cared for long enough and has not reached blooming age, then it is unlikely to bloom. This requires good daily care and patient waiting.
In addition, if the flowering period of the Christmas cactus has not arrived, it will not bloom either. The flowering period of the Christmas cactus is generally later than that of the crab claw cactus (Schlumbergera truncata). It begins to show buds in October——November, and can bloom by February. It generally withers at the end of March and the beginning of April.
2. The Christmas cactus does not bloom because of improper lighting
Light is an important condition for the Christmas cactus to bloom. For the Christmas cactus, short-day conditions are needed for good blooming, which requires a suitable duration of sunlight.
Generally, the Christmas cactus begins flower bud differentiation in autumn. At this time, short-day conditions must be ensured for blooming to be favorable. If the light duration is too long, it will affect the blooming of the Christmas cactus.
Generally speaking, autumn light in the northern regions of our country can meet the blooming needs of the Christmas cactus, but the southern regions are different. So when the flower buds of the Christmas cactus are growing, it requires a dark environment of more than 12 hours every day, and sometimes shading is needed. At night, care should also be taken; it is best to place the cactus where there is no light, otherwise blooming will be affected.
Propagation method of the Christmas cactus by cuttings
1. Christmas cactus cutting propagation——timing
For cuttings of the Christmas cactus, the best season is the growing period, and after flowering, April-May is optimal.
2. Christmas cactus cutting propagation——soil medium
For home cuttings, you can buy prepared cutting medium, or use medium-coarse river sand, but it must be rinsed several times with clean water before use. Do not use sea sand or river sand from saline-alkali areas; they are not suitable for the growth of ornamental plants.
3. Christmas cactus cutting propagation——water and fertilizer
After cuttings, place them in a shaded spot before rooting and water sparingly; they will root in about 20 days. After flower buds form, the potting soil must not be too dry or too wet, to avoid flower bud drop.
During the growing period of the Christmas cactus, apply a dilute organic liquid fertilizer once every 2-3 weeks, or a small amount of compound chemical fertilizer.
4. Christmas cactus cutting propagation——specific method
Take 1-4 stem segments or large branches with side branches for cuttings, either is fine. When taking cuttings, do not let the wound touch water; let it dry in a place without direct sunlight for two or three days so the wound heals.
The care methods for the Christmas cactus are very similar to those for cacti, but the Christmas cactus holds more water in its body and is not as tough-skinned and thick-fleshed as cacti, so it needs more careful attention in care. In particular, moisture control must be done well, otherwise the whole plant may rot.
Why does the Christmas cactus not bloom? Analysis of the reasons for not blooming
Many flower lovers encounter the problem of the Christmas cactus not blooming but do not know the reason. This article compiles some reasons that easily lead to the Christmas cactus not blooming, which flower lovers can use as reference to troubleshoot where the problem lies.First, we need to know that Christmas cactus cuttings or grafted seedlings generally take 2-3 years to bloom. For Christmas cacti grafted in spring, they do not form buds or bloom in winter of that year, and can only achieve blooming in winter of the second year. If grafted in autumn, most can form buds and bloom in winter of that year. The reason is that the scion was formed on the mother plant, but in winter of the second year it no longer forms buds or blooms, and must bloom in winter of the third year. If the care time is not enough, be patient and wait a bit longer. Also, the flowering period not arriving does not mean it will not bloom. The flowering period of the Christmas cactus is about one month later than that of the crab claw cactus. It generally begins to show buds from late October to early November, blooms fully in February, and finishes blooming at the end of March and the beginning of April.
Second, and also the most important reason, is that the Christmas cactus is a short-day blooming plant, and the main factor affecting blooming is the duration of light. After autumn, short-day conditions favor flower bud formation, requiring a continuous dark environment of 12-14 hours per day. Note that there should not be overly bright light at night, otherwise bud formation and blooming will be affected. In addition, according to what flower lovers have learned, a lack of nutrient elements such as phosphorus and potassium fertilizer will also affect its blooming effect.
Generally speaking, in the northern part of our country, natural light after late September can already satisfy this. For small-scale home cultivation, artificial shading is not needed, but care should be taken to place the flower pot where there is no light at night. Flower lovers in the southern regions, however, should pay attention to the short-day issue.
Below, let us learn about the care methods for the Christmas cactus.
The Christmas cactus likes warmth, is not cold-tolerant, and is not heat-tolerant either. It is drought-tolerant but not waterlogging-tolerant, and is suitable for growing in well-drained, moist, fertile, slightly acidic sandy soil. After the beginning of autumn, the Christmas cactus should still be placed in a place with more sunlight to receive sunlight. Generally, apply a fertilizer mainly of phosphorus and potassium fertilizer supplemented by nitrogen fertilizer once every half month, to grow good autumn branches. The Christmas cactus is not cold-tolerant; move it indoors in early October, place it in a sunny spot, appropriately reduce fertilizer and water, and pay attention to ventilation to promote flower bud differentiation. When small flower buds grow on the stem segments, until before blooming, apply a fast-acting phosphorus-potassium fertilizer solution once every half month. During blooming, fertilizing is strictly forbidden. In winter when it is cold, the indoor temperature for the Christmas cactus is best at 10°C to 15°C, and must not be lower than 5°C, otherwise it will cause bud drop. Watering should be done at noon on sunny days with water at about 10°C, and the amount must not be large; do not water with cold water. At this time, the more sufficient the light, the better, and it is best to ensure more than 6 hours of light. Also, frequently turn the direction of the pot so that every layer and every side receives photosynthesis, improving the flowering rate.
Summary: The above is the analysis of the reasons why the Christmas cactus does not bloom. We hope it is helpful to everyone.