Why Doesn't the Christmas Cactus Bloom? Detailed Guide to Growing Methods and Precautions

Among cacti there are some unique varieties that look somewhat different from what we usually think of as cacti, yet they are indeed covered in spines and have a certain cactus feel, so people took this unique cactus, along with some of its appearance features, and created a new name for it.

Growing Methods for the Christmas Cactus

1. Temperature: The Christmas cactus likes warmth, with a suitable growing temperature of 15-25°C. It is not cold-tolerant, and the overwintering temperature is best kept above 51°C. At 20°C growth is slow, and at 15°C growth stops. At low winter temperatures the plant is prone to cold damage, which can cause grafted Christmas cactus plants to drop a large number of flowers.

2. Light: The Christmas cactus likes partial shade and dislikes strong direct sunlight. Too much light will make the plant turn yellow and withered, with shriveled stems and leaves. From May to September, shading should be provided, while the rest of the time it needs plenty of sunlight. The formation and development of flower buds requires a continuous dark environment of 12-14 hours per day. During flower bud differentiation and bud setting, there should not be overly bright light at night, otherwise it will affect bud setting and blooming. During flowering, appropriate shading can extend the flowering time.

3. Watering: The Christmas cactus is relatively drought-tolerant and dislikes waterlogging. During the spring and autumn growing periods, water should be supplied generously to keep the potting soil moist, but do not water too much, otherwise it easily causes root rot. During flowering, the potting soil should be moist but on the dry side; watering too much and making the potting soil too wet will cause flower buds to wither and drop. During the dormant period after flowering and the semi-dormant period in summer, watering should be controlled, and rain exposure should be prevented; too much watering or rain exposure in summer will both cause root rot.

4. Fertilizing: The Christmas cactus does not like heavy fertilizer, but because it sets many buds and blooms abundantly, it consumes 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 cause bud and flower drop. Fertilizing should be stopped during winter dormancy and summer semi-dormancy.

5. Pruning: In spring, carry out one pruning when repotting, thinning out overly dense branches and shortening the remaining branches. Cutting off the front jointed leaf-like stems can benefit leaf growth afterward and strengthen the plant's growth vigor. After buds appear, if there are too many flower buds, thin them out; generally keep 1 flower bud per leaf-like stem.

6. Repotting: Repot the Christmas cactus once every 2 years, preferably after flowering and before sprouting growth, 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 them in the pot.

Precautions for 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 for it to bloom. After being chilled, it needs to stay dry until it is about to bloom; during this period no watering is needed.

After entering spring, still do not water; wait until the flower buds are about the size of a soybean, then you can begin watering thoroughly, which can promote more flower buds in the Christmas cactus and help it bloom.

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 combined with repotting, thinning out overly dense branches and shortening the remaining branches. After pruning, spray lime sulfur mixture to reduce spring disease damage.

Why the Christmas Cactus Doesn't Bloom

1. The Christmas cactus doesn't bloom because the time hasn't come

The Christmas cactus does bloom. Generally, cacti grown from cuttings or grafts need 2——3 years of growing before they can possibly bloom. So when growing a Christmas cactus, if it hasn't been cared for long enough and hasn't reached blooming age, then it is unlikely to bloom. This requires good daily care and patient waiting.

In addition, if the Christmas cactus's flowering period hasn't arrived, it also won't bloom. The Christmas cactus generally blooms later than the crab claw cactus (Schlumbergera truncata); it begins to show buds in October——November, and can bloom by February, and generally withers by late March and early April.

2. The Christmas cactus doesn't bloom because of improper light

Light is an important condition for the Christmas cactus to bloom. For the Christmas cactus, it needs short-day conditions to bloom well, which requires suitable day length.

Generally, the Christmas cactus begins flower bud differentiation in autumn, and at this time short-day conditions must be ensured for blooming to be favorable; if the light period is too long, it will affect the Christmas cactus's blooming.

Under normal circumstances, autumn light in the northern regions of our country can meet the Christmas cactus's blooming needs, but the southern regions are different. So when the Christmas cactus's flower buds are growing, it requires a dark environment of more than 12 hours every day, and sometimes shading is needed. At night, care is also needed; it is best to place the cactus in a place without light, otherwise it will affect blooming.

Cutting Propagation Methods for the Christmas Cactus

1. Christmas cactus cutting propagation——time

For Christmas cactus cuttings, the best time is during the growing period, with April-May after flowering being 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 flowering plants.

3. Christmas cactus cutting propagation——water and fertilizer

After cutting, place in a shady spot before rooting, water sparingly, and roots will form 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 Christmas cactus's growing period, apply a dilute organic liquid fertilizer once every 2-3 weeks, and a small amount of compound chemical fertilizer can also be applied.

4. Christmas cactus cutting propagation——specific method

Take 1-4 stem segments or large branched stems for cuttings. When cutting, keep the wound away from water, and let it dry in a spot without direct sunlight for two or three days to let the wound heal.

The growing 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 thick-skinned as cacti, so it needs more careful attention in care. In particular, moisture control must be done well, otherwise the whole plant may very likely rot.