Understanding the Christmas cactus bloom cycle—little water, dormancy, light, and temperature—will help you force a Christmas cactus to bloom.
Start by minimizing how much water the plant gets. This often occurs sometime in the fall, usually in or around October or the beginning of November (in most places).
Just enough irrigation should be reduced to keep the soil moist. Only water until the top 1 inch (2.5 cm) or so of soil feels dry to the touch. The plant will be able to go into dormancy as a result. A Christmas cactus needs to be dormant in order to blossom.
You must relocate a Christmas cactus such that it will experience 12 to 14 hours of darkness in order to further force the plant to bloom. While Christmas cactus can tolerate bright, indirect light during the day, it needs at least 12 hours of complete darkness at night to promote bud formation.
In addition to dark surroundings, your Christmas cactus needs cool temps. It should be between 50 and 55 degrees F on average (10-13 C.). As a result, confirm that the location can satisfy the needs for both light and temperature.
How can a Christmas cactus be encouraged to bloom?
Start six to eight weeks before you want your forest cactus to blossom by placing it in a dark closet for 14 hours every night. Bring it back outside into a bright area during the day. The plant should blossom brilliantly for the holidays once the buds start to form, at which point the closet treatment is no longer required.
Why isn’t my Christmas cactus flowering?
Due to its short day length, the Christmas cactus cannot blossom due to drought stress or excessive light exposure. Christmas cacti are adapted to wet, frequently rainy jungles. If the conditions are dry or there are too many hours of sunshine during bloom production, it does not flower.
I’ve listed here a few other reasons that can stop the Christmas cactus (Schlumbergera) from flowering:
Continue reading to learn why your Christmas cactus isn’t blossoming and the finest methods for putting remedies in place so that it can produce blossoms.
When should you put a Christmas cactus in the dark?
Put your Christmas cactus in complete darkness for at least 12 hours every day, beginning in October, to start blooming. In time for the holidays, the plant will have around eight weeks to develop buds and blossom as a result. To encourage your Christmas cactus to bloom again in February after the holiday flowering time, keep up this same pattern.
How long can a Christmas cactus live?
Christmas cacti can survive up to 100 years or longer if given the right care. Even news stories of families passing on their Christmas cacti to future generations as living heirlooms have been documented, such as this one about a particularly resilient plant that dates back to the 1860s. Wow!
The majority of Christmas cacti, however, only live for 20 to 30 years with proper care, despite the fact that they can last for decades and brighten your home every holiday season. By that time, the plants typically perish from widespread problems including overwatering, underwatering, freezing weather (if they spend part of the year outside), pests, illnesses, loss of interest, or simple neglect.
Help, my Christmas cactus is yellowing!
Yikes! Your watering routine is typically to blame if your Christmas cactus doesn’t seem to be growing well. These creatures require more water than desert cacti, but they also don’t want their soil to be wet.
You’re probably not watering your Christmas cactus enough if the leaves are becoming wrinkled and appear withered. You possibly overdid it if they’re more mushy and yellow-black in color. To get rid of any rotten roots and repot your plant in dry soil, you might need to uproot it.
Why are the leaves on my Christmas cactus limp?
Wilted leaves are frequently caused by improper watering because it is simple to provide too much water (rather than not enough). A Christmas cactus’ weak or drooping leaves are typically the result of either damp soil or root rot. If you have one issue, it will almost certainly lead to another.
Make sure that any extra water you give your Christmas cactus drains slowly but steadily through the drainage holes. If not, your potting soil may be too dense and may not be working. To promote aeration, you can repot the plant in bromeliad soil or fluff it up with perlite.
During the spring through winter growing season, keep the soil lightly moist; only water when the top inch of soil feels dry to the touch. After the flowering season is over, it’s good to allow the soil get a little bit dry in the middle of winter between waterings, but don’t let it get completely parched.
Is a Christmas cactus toxic to cats and dogs?
I’ll keep this short: no. The ASPCA states that Christmas cacti are not dangerous, despite the fact that ingesting any plant may cause some mild vomiting or diarrhea.
How do I get my cactus to bloom?
Cacti and succulents prefer summer and winter seasons, as well as a clear variation between night and day temperatures. Succulents prefer colder outdoor nighttime temperatures of 50-550F (10-130C) or at least 60-650F indoor nighttime temperatures (15-180C). Succulents prefer a noticeable contrast between their night and day temperatures to imitate their natural habitat, with the low night temperatures playing a crucial role in the plant’s growth cycle, especially when kept in a controlled setting.
If you want to see your succulents and cacti bloom, overwintering is also crucial. For desert cacti in particular, this can be accomplished by keeping plants cool and largely dry over the winter. During the winter, keep them at a comfortable temperature of between 35 and 440 °F (1.5-70C). If maintained indoors during the winter, try to keep them in an unheated room or keep the temperature low to provide them the necessary cold winter season. This does not apply to holiday cacti, such as Rhipsalis, Schlembergera, and Hatiora, which have different moisture and temperature needs than desert cacti (see below for Holiday cactus blooming tips).
Make sure the plants are kept in a bright area and receive enough sunshine throughout the year, including during the darker winter months. Most succulents and cacti require at least 4-6 hours of bright sunshine every day, if not more. Some plants require filtered but bright light to avoid solar damage since they cannot withstand harsh, full sun. Lack of light causes plants to gradually etiolate, become paler, and spread out in search of more light. To provide adequate lighting, place indoor plants in windows with a south or east orientation. If more light is required indoors, think about using grow lights. Lack of sunshine stunts the growth of succulent plants, and they are unlikely to blossom as effectively.
Giving your plants the nutrition they require instead of fertilizing them will assist maintain healthy growth and promote blooms. Flowers require a lot of energy to grow, therefore giving plants more nutrients during flowering season will assist meet their nutritional requirements. The best time to fertilize is during the active growing season, which is in the spring and summer. Fertilizers work best when applied every two weeks at a quarter- or half-strength. Avoid fertilizing during the winter and towards the conclusion of the fall growing season. It is acceptable and typical to use a balanced fertilizer blend that has been diluted to half strength. Cacti and succulent-specific fertilizer mixtures are also appropriate.
Although cacti and succulents can store water, they still require frequent watering during the active growing season. Regular watering helps to guarantee that they don’t lose all the water they need to store for growth. Regular watering also improves their ability to resist the hotter summer sun. Water plants thoroughly during the active growing season until water begins to leak out of the pot’s openings. Don’t water again until the soil has dried out. Before watering, check the top inch of the soil for moisture. During the hot summer months, watering should be done more frequently; during the chilly winter months, less frequently. Succulents and cacti suffer from overwatering, so make sure to let the soil dry out in between waterings.
Succulents and cacti require a well-draining soil in addition to suitable watering methods. Cacti and succulents don’t like to sit in water. If left moist for too long, their roots are prone to rot. The capacity of a succulent potting mix to drain efficiently is its most crucial requirement. You have the option of using store-bought potting soil or making your own for succulents. Giving them the proper medium increases their chances of flourishing and blossoming. Keeping your plants content will boost blooming.
Does Christmas cactus benefit from Epsom salt?
The winter solstice, which occurs on December 21 in the Northern Hemisphere, is the day and night with the shortest lengths of the year.
Christmas cacti, poinsettias, kalanchoes, and chrysanthemums are a few common plants that people give as gifts during the holidays. Their flowering is perfectly timed for the shorter days that we enjoy during this season.
The development of flower buds in many plants is influenced by how much light the plants receive. “Photoperiodism” refers to a plant’s response to the length of the day. While some plants flower as the days get shorter, others do so as the days become longer. Some plants are neutral, meaning that day length has no direct impact on flowering.
Brazilian Christmas cacti are common indoor plants that come in a wide range of hues, including red, rose, purple, lavender, peach, orange, cream, and white. In shaded rain forests, these plants thrive as epiphytes among tree branches, and their cascading stems make them an excellent choice for hanging baskets. If the plants are managed at a temperature of 68 degrees Fahrenheit, flowering can last seven to eight weeks.
During this time of year, customers frequently phone the University of Georgia Cooperative Extension office upset because their Christmas cacti or other short-day indoor plants did not bloom. They are frequently shocked to discover that if these plants are kept indoors year-round, the artificial light in the home can interfere with their natural cycle of exposure to sunshine. In order to simulate natural daylight exposure with shorter days, it becomes a difficulty.
One option is to put these plants near a window in a room that receives only natural light, turning off the artificial lighting at night. A different choice is to keep these plants outside as long as you can in the fall and then bring them inside just before the risk of freezing weather. In the Atlanta region, this typically means keeping the majority of tropical indoor plants outside until close to the end of October. Short-day plants are already set to begin flowering during the approaching holidays at this point.
On his porch, my grandfather used to keep a Christmas cactus all summer long in a hanging basket before taking it inside just before the first freeze each year. It was a large plant that would blossom in large numbers between Thanksgiving and Christmas. He maintained this plant for almost ten years, and it gave him a lot of Christmas delight.
A Christmas cactus has the advantage of not losing leaves like poinsettias or other houseplants, which is one of its many advantages. Because Christmas cactus lack genuine leaves, photosynthesis takes place inside the green stem segments known as phylloclades. To encourage branching terminals for more flowers, pinch back the stems in the first few weeks of June. You can also utilize stem portions with three to five segments to root new plants.
Temperature control and photoperiod (control of day and night length) control are key factors in the fall flower bud formation of Christmas cacti. Before flower buds will set, each night must have at least 14 hours of nonstop darkness.
For a full bud set, long nights must begin around the middle of September and last for at least six weeks. Be aware that even two hours of intermittent lighting can prevent flower buds from setting. Typically, buds will appear in approximately four weeks. Once the buds are set, the photoperiod has little impact on flowering.
Christmas cacti may live in dry, marginally submerged environments in the spring and summer. Avoid letting the soil become soggy, especially during the lengthy winter evenings. To stop flower buds from dropping off after bud set in the fall, the soil must be kept consistently moist. In the saucer underneath the pot, never let water stand.
From the time new growth begins in late winter or early spring through the summer, fertilize plants every month using a liquid fertilizer of half strength, such as 20-20-20 with trace elements. Compared to many plants, Christmas cacti have a greater magnesium need. Epsom salts (magnesium sulfate) should be used as a fertilizer every month during the growing season; however, it should not be used the same week as conventional fertilizer. Stop fertilizing in the late summer to increase the formation of bloom buds in the fall.
Can Christmas cactus be grown with Miracle Grow?
When Christmas cacti are tightly contained in their containers, they typically grow bigger and produce more flowers. But once the roots have nearly filled the pot, proceed as follows:
1. Choose a replacement pot with a drainage hole that is only 1 to 2 inches wider than the old one.
2. To help your Christmas cactus thrive straight away, fill the new container 1/3 full with Miracle-Gro Cactus, Palm & Citrus Potting Mix, which offers great drainage and a little amount of food.
3. After placing the plant in the pot, make sure the root ball’s top is positioned 3/4 to 1 inch or less below the pot’s rim.
4. Fill in the area around the rootball, leaving a gap of about 3/4 inch between the soil’s top and the container’s lip (for easy watering).
5. After giving the plant plenty of water, let it drain, then relocate it to a permanent location. (Place a water-resistant saucer underneath the pot to prevent spills on the furniture.)
Secret tip: After plants have recovered from blooming and begun to grow again in late spring, this is the ideal time to repot them.
A Christmas cactus can grow elderly and still bloom.
Here is a flowerless Christmas cactus that is otherwise completely healthy. One of the main causes of this species’ failure to bloom is an inadequate amount of nocturnal darkness.
A couple of my wife’s Christmas cacti are about 20 years old. Neither last year nor this year did they bloom. Are they too old?
A: I don’t believe this is a case of plain old age because I’ve seen Christmas cactuses blooming profusely for decades in the same pot with absolutely little maintenance. Over time, some plants peter out, but this one rarely does.
I’d start by making sure the Christmas cacti are receiving enough continuous darkness. They require at least 12 to 13 hours of darkness per night, beginning at the end of September, just like poinsettias.
Flower buds set and then open after around 6 weeks of that amount of darkness, usually around Thanksgiving or into December.
During that period of bud-set, the plants thrive in complete, unbroken darkness. The flowering process can be stopped by keeping a light on until late at night (or all night) or by switching lights on and off throughout the dark hours.
Some rooms are ideal for Christmas cactus overnight lighting because they are bright throughout the day but continuously dark after sunset. If you don’t have a space like that, you’ll either need to cover the plants every night or move them in and out of dim areas throughout the night, like a closet.
Although it’s probably too late for flowers this year, I’ve observed several Christmas cacti blooming after the holiday season provided they had the proper amount of gloom.
If it isn’t the problem, potting into new soil might be beneficial. Christmas cacti don’t require or desire to be regularly potted into larger pots like some houseplants do because they actually want to be pot-bound.
The optimum time to take this trip is around the end of winter. Use a fresh, well-drained mix when repotting; ideally, choose a bag labeled for African violets or bromeliads.
Then, from spring through mid-summer, start fertilizing your plants every two to four weeks with a balanced houseplant fertilizer (something close to 10-10-10). In the event that your existing blend runs out, that will guarantee adequate nutrients.
When you use softened water or fertilize frequently, you may occasionally experience issues with excess salt buildup that can be resolved by applying fresh potting soil.
The aforementioned factors may cause no flower buds. But if you noticed buds developing before dropping off, that’s a different problem.
A sudden change in environment, such as transferring a plant from the outside to the inside after the buds have formed, might cause buds to form but drop before opening. Rotting can also result from overwatering.
Christmas cactus can be placed outside during the summer, but they should be brought inside as soon as Labor Day arrives.
They prefer pretty bright light once they are inside, but they prefer 12 to 14 hours of total darkness at night.
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