.png)
How to Get Your Holiday Cactus to Bloom: Fall Care Tips for Colorado Plant Lovers
Fall is officially arriving in Colorado. The days are getting shorter, temperatures are cooling down, and before long we'll be turning on the heat and preparing our homes for winter.
For plant lovers, September also marks the beginning of an important season for one of our favorite houseplants: the holiday cactus.
Whether you have a Thanksgiving cactus, Christmas cactus, or another Schlumbergera variety, those beautiful blooms don't necessarily happen automatically. Holiday cacti respond to changes in light and temperature, and what you do during the fall can make a big difference in whether your plant produces a few flowers, or becomes completely covered in blooms.
Here in Denver, our sunny days, cool fall nights, and extremely dry indoor air create some unique growing conditions. Fortunately, with a little planning, Colorado's fall weather can actually work in your favor.
At Denver Plant Club, we love helping plant parents understand not only what their plants need, but why they need it. Here's how to prepare your holiday cactus this fall and encourage the biggest, healthiest bloom possible.
First, Is It a Christmas Cactus or Thanksgiving Cactus?
Before we talk about blooming, there's something worth clearing up.
Many plants sold as "Christmas cactus" are actually Thanksgiving cacti, and the two are closely related. Both belong to the genus Schlumbergera and require similar care, but they tend to bloom at slightly different times.
One of the easiest ways to tell them apart is by looking at the edges of their stem segments.
Thanksgiving cactus segments generally have more pointed or claw-like edges and typically begin blooming earlier in the holiday season.
Christmas cactus segments tend to have smoother, more rounded edges and usually flower somewhat later.
There's also an Easter cactus, which belongs to a different genus and, as the name suggests, typically blooms in spring.
Regardless of which holiday cactus you own, the principles for encouraging fall bud development are very similar.
Why Does a Holiday Cactus Bloom in the Fall and Winter?
Holiday cacti don't bloom simply because December appears on the calendar.
They respond to environmental cues.
In their natural habitat, seasonal changes in day length and temperature tell the plant that it's time to begin producing flower buds. We can recreate those signals inside our homes.
The two biggest factors are:
Longer periods of uninterrupted darkness
Cooler nighttime temperatures
This is why September and October are so important. What happens during these weeks helps determine the flowers you'll enjoy later in the season.
Give Your Holiday Cactus Longer Nights
If you want your holiday cactus to bloom heavily, darkness is one of your most useful tools.
As fall approaches, the plant benefits from roughly 12–14 hours of uninterrupted darkness each night for several weeks.
And "uninterrupted" matters.
A plant sitting next to a lamp that's turned on until midnight isn't experiencing the same nighttime conditions as a plant sitting in a naturally dark room.
If your cactus isn't blooming reliably, consider moving it to a room where artificial lights aren't used much at night.
A spare bedroom, office, or naturally darker room can work well.
During the day, return to providing plenty of bright, indirect light.
The combination of bright days and long, dark nights helps signal that the seasons are changing.
Take Advantage of Colorado's Cooler Fall Temperatures
Here's one area where living in Colorado can actually help.
Holiday cacti respond well to cooler nighttime temperatures as they prepare to bloom. Ideally, they appreciate nights around 55–65°F during bud development.
Denver's cool September and October nights can naturally provide those conditions.
If your home stays very warm around the clock, consider placing your plant in a cooler room at night. Just don't expose it to freezing temperatures or sudden cold drafts.
You want cool...not frozen.
A protected indoor area near a window may naturally become several degrees cooler overnight than the rest of your home.
That temperature change can be exactly what your holiday cactus needs to begin setting buds.
Don't Overwater During Fall
Holiday cacti may have "cactus" in their name, but they aren't desert cacti.
In nature, Schlumbergera species grow in humid environments rather than dry desert soil, so they appreciate more moisture than your typical cactus or succulent.
That doesn't mean they want constantly wet soil.
As fall approaches and growth begins slowing, allow the upper portion of the potting mix to dry slightly between waterings.
Before watering, check the soil rather than following a calendar.
This is especially important in Colorado because our dry air can make the surface of a pot appear dry while moisture remains deeper around the roots.
When you do water, water thoroughly and allow excess moisture to drain from the container.
Avoid leaving the plant sitting in standing water.
Colorado's Dry Air Can Be a Challenge
Humidity is one of the biggest differences between growing houseplants in Denver and growing them in many other parts of the country.
Once furnaces start running, indoor humidity can drop dramatically.
Holiday cacti appreciate more humidity than many common houseplants, so Colorado's dry winter air can sometimes cause:
Wrinkled stem segments
Drying buds
Bud drop
Slower growth
If your home becomes particularly dry, consider using a humidifier nearby or grouping several houseplants together.
Be especially careful about placing your holiday cactus directly beside heating vents, fireplaces, or other sources of hot, dry air.
Stop Fertilizing Before Blooming
Spring and summer are the primary growing seasons for most holiday cacti.
During active growth, occasional fertilizer can support healthy new stems and roots. But once fall arrives and you're trying to encourage flowers, it's generally time to reduce or stop feeding.
Your goal now isn't to encourage lots of new green growth.
It's to help the plant transition into its flowering cycle.
After flowering is complete and active growth eventually resumes, you can begin your normal fertilizing routine again.
Once You See Buds, Stop Moving Your Plant Around
This is one of the most important holiday cactus tips, and one people often learn the hard way.
You spend weeks getting everything right.
Your cactus develops dozens of tiny buds.
You get excited and move it to the dining room so everyone can see it.
And then...
The buds start falling off.
Holiday cacti can be surprisingly sensitive once buds develop. Major changes in temperature, lighting, watering, or location can cause bud drop.
Once your plant is covered in developing buds, consistency becomes your friend.
Try to avoid:
Moving it repeatedly
Sudden temperature changes
Cold drafts
Hot heating vents
Letting the soil become extremely dry
Overwatering
Choose where you want to enjoy your blooming cactus and let it settle in.
Should You Repot a Holiday Cactus Before It Blooms?
Usually, no.
Holiday cacti often flower quite happily when slightly root-bound. Repotting immediately before bloom season can create unnecessary stress at exactly the time you're trying to encourage flowers.
If your plant clearly needs repotting, we'd generally recommend waiting until after flowering unless there's an urgent problem such as root rot or damaged soil.
When it is time to repot, choose a well-draining soil mixture and avoid jumping into an unnecessarily large container.
If you're unsure whether your plant needs repotting, bring it into Denver Plant Club and we can help you determine what's going on.
What If My Holiday Cactus Still Won't Bloom?
You've owned your cactus for years.
It looks healthy.
It grows.
But every holiday season arrives without flowers.
What gives?
Usually, the plant isn't receiving a strong enough seasonal signal.
Start by asking:
Does it get dark at night?
A cactus in a brightly lit living room may not receive enough uninterrupted darkness.
Does the temperature change?
Homes kept at the same warm temperature 24 hours a day may make flowering more difficult.
Are you fertilizing heavily into fall?
That can encourage vegetative growth instead of helping the plant transition toward flowering.
Has the plant experienced a major change?
Repotting, moving, drafts, or dramatic changes in watering can all create stress.
Don't give up on it. Holiday cacti are remarkably long-lived plants, and adjusting their fall routine can make a significant difference.
How to Keep Your Holiday Cactus Blooming Longer
Once those flowers finally open, you naturally want them to last.
Keep the plant in bright, indirect light and away from major sources of heat.
Cooler temperatures generally help flowers last longer than very warm indoor conditions.
Continue checking the soil regularly and water when appropriate, but don't compensate for blooming by suddenly increasing watering.
Most importantly, enjoy it.
A mature holiday cactus covered in flowers is one of the best indoor plant displays of the season.
Holiday Cacti Can Live for Decades
One reason we love holiday cacti is that they're not necessarily plants you enjoy for one season and replace.
With proper care, they can live for decades and become surprisingly large.
They're also relatively easy to propagate, which means a single plant can eventually become plants shared with friends and family.
That's part of what makes them such meaningful holiday plants. A well-cared-for cactus can become something that comes out in bloom year after year and is eventually passed along to someone else.
Your September Holiday Cactus Checklist
As Denver moves into fall, remember these essentials:
Give your holiday cactus bright, indirect light during the day.
Provide approximately 12–14 hours of uninterrupted darkness at night while encouraging buds.
Take advantage of cooler fall nights, aiming for roughly 55–65°F when practical.
Reduce fertilizer as the plant enters its flowering cycle.
Check the soil before watering rather than watering on a fixed schedule.
Protect the plant from heating vents and extremely dry air.
Once buds appear, avoid repeatedly moving the plant.
Hold off on unnecessary repotting until after flowering.
A little attention during September and October can pay off with an incredible display later in the year.
Frequently Asked Questions About Holiday Cactus Care
When should I start preparing my Christmas cactus to bloom?
September and early October are great times to begin adjusting light and temperature conditions for plants you hope will flower during the holiday season.
How much darkness does a Christmas cactus need to bloom?
Providing roughly 12–14 hours of uninterrupted darkness each night for several weeks can help initiate flower buds.
Why are the buds falling off my holiday cactus?
Bud drop can be caused by sudden changes in temperature, lighting, watering, humidity, or location. Once buds appear, try to keep the plant's environment consistent.
Do Christmas cacti like Colorado's dry climate?
Holiday cacti can grow very successfully in Colorado, but they appreciate more humidity than desert cacti. Denver's particularly dry indoor winter air may require additional attention to humidity and watering.
Where can I buy holiday cactus in Denver?
Denver Plant Club on South Broadway carries a rotating selection of indoor plants throughout the year, including seasonal plants when available. Stop by the store to see what's currently in stock and get help choosing a houseplant that's right for your home.
Find Holiday Cacti and Houseplants in Denver
If you're looking for a holiday cactus in Denver, need help getting an existing Christmas cactus to bloom, or simply want to add something new to your indoor plant collection, come visit us at Denver Plant Club on South Broadway.
Our selection of houseplants changes regularly throughout the year, and our team can help you choose plants based on your home's lighting, your experience level, pets, lifestyle, and Colorado's unique growing conditions.
We're more than a place to buy plants. Education and ongoing support are a big part of why we're called Denver Plant Club. Whether you purchased your plant from us or somewhere else, we're happy to help answer your plant care questions.
Stop by our Denver plant store to see what's new, explore indoor plants and planters, and get personalized advice from people who care for houseplants in the same dry Colorado climate you do.
Visit us in Platt Park or check out our workshops and plant care resources online. Let's grow through the fall together.
Comments