Bloom Watch 2025
The Queen Arrived on June 9, 2025!
As the summer heat builds, a quiet transformation begins in the desert—the Peniocereus greggii, the elusive Queen of the Night, starts to bud. These night-blooming cereus cacti grow in spurts, preparing for a breathtaking event: a mass bloom that happens all at once, on a single night, sometime between late May and July.
Each year, for one unforgettable evening, Tohono Chul welcomes visitors from near and far to witness this rare desert phenomenon. Stroll luminaria-lit trails, marvel at the stunning blossoms, and breathe in their intoxicating scent as the garden comes alive under the stars.
Because this magical bloom is nearly impossible to predict, there may be as little as 12 hours’ notice between the announcement and Bloom Night itself. Stay tuned—and stay ready.
Don’t miss out! Become a member today and experience this exclusive evening with the Queen of the Night.
Bloom Watch Diaries
On Monday, June 9, 2025, over 200 members joined us under the moonlight to witness the fleeting, magical bloom of the Queen of the Night, Peniocereus greggii.
With 28 blossoms opening nearly 20 days earlier than expected, this year’s event reminded us just how unpredictable and extraordinary nature can be.
Read the recap below and relive the wonder of one of the Sonoran Desert’s most breathtaking phenomena.
Bloom Night 2025:
An Early & Enchanting Bloom
JUNE 12, 2025
Bloom Watch #2:
The Queen is HERE
JUNE 9, 2025
Bloom Watch #1:
Tracking the Bloom
JUNE 4, 2025
Get Updates with the Bloom Watch Newsletter or on Social Media!
The best way to ensure you don’t miss Bloom Night is by subscribing to Bloom Watch email updates. Bloom Watch emails will inform you of the progress of the blossoms right up to the day we announce Bloom Night. Sign up today!
We also share Bloom Watch updates on social media—follow along on Instagram or Facebook for the latest updates!
Once you’ve entered your email address, click continue and then select the Bloom Watch email list from the drop-down menu.
Members Exclusive
Bloom Night is an exclusive members-only event. Your support helps preserve the Desert View Trail and our Peniocereus greggii collection while we work to ensure proper pollination of these special plants and create a more intimate experience for those visiting the Queen.
Don’t miss out! Become a member today and experience this exclusive evening with the Queen of the Night.
Support Bloom Night’s Future
Each Queen of the Night bloom is a moment of wonder. We’re working to double our collection so more people can experience this magical moment. Your support will help us reach our $5,000 goal to care for seedlings, expand our plantings, and continue our research. Please consider making a gift today!
Questions? See below for answers to frequently asked questions.
Bloom Night Membership FAQs
Why is Bloom Night Members Only this year?
This year Bloom Night will be a members only event in order to provide a more intimate and enjoyable experience for attendees. By limiting the number of guests, we can better preserve the Desert View Trail and our Peniocereus greggii collection. Fewer people on the trail means less disturbance, creating a peaceful space for both guests and the nocturnal insects that pollinate the Queens. Your membership support is crucial for caring for these special plants and maintaining our gardens.
Can I bring someone with me who is not a member?
Please check your membership level to see if it includes additional guest allowances. If not, consider upgrading to a dual or family membership so you can bring a friend or family member along. If they love Tohono Chul and enjoy the event, encourage them to become a member to enjoy exclusive access to future events and a variety of benefits year-round.
How will becoming a member benefit me in the long run?
Becoming a member not only grants you access to exclusive events like Bloom Night but also provides numerous benefits such as discounts, early access to plant sales, free daily admission, and reciprocal admissions at other public gardens throughout the country. Your support helps us maintain the garden and its collections for future generations.
What is the cost of membership?
Membership costs vary depending on the level and benefits. Please visit our website or the admissions office for detailed information on membership options and pricing.
How do I prove my membership status at the event?
Please bring your membership card or a digital proof of membership on your phone such as a confirmation email or receipt. Our staff will check your membership status at the entrance.
What if I forget my membership card?
If you forget your membership card, we can look up your membership status in our system.
What if I just became a member—can I still attend?
Yes, new members are welcome and encouraged to attend Bloom Night! If you’ve just signed up and haven’t received your membership card yet, simply bring your membership confirmation email or receipt for entry. You don’t need to print it; showing it on your phone or smart device is perfectly fine.
Will there be another opportunity to see the blooms if I’m not a member?
Yes, the morning after Bloom Night we will open early at 6 am to the general public. Daily admission fees apply.
Can I use a guest pass or reciprocal admission from another garden to enter Bloom Night?
Guest passes and reciprocal admission benefits are not valid for special events.
Check out these videos of Bloom Night!
Time-lapse footage provided by Arizona Daily Star
Time-lapse footage provided by Stephen Buchmann
Bloom Night | Quick Tips & Info
IF YOU GO
- Wear comfortable, closed-toed walking shoes and outdoor clothing.
- Bring a flashlight and a refillable water bottle
- Bring a camera with a flash
- Bloom Night is considered a special event, and guest passes are not eligible for use.
- Bloom Night is a members-only event. Not a Member? Become one here or in person on the night of the event!
THE FACTS
- The majority of flowers bloom the same evening, usually between late May and Mid-July.
- Tohono Chul has the largest private collection of Night Blooming Cereus in the world.
- Researchers still don’t know how the flowers know when to bloom en masse.
- Flowers typically start opening around 7 pm and are in full bloom by 10 pm.
Bloom Night | History
It has a hallowed place in Tohono O’odham storytelling, has inspired folk songs, paintings, thousands of photographs, and even a perfume. The Night Blooming Cereus, Peniocereus greggi, the aptly nick-named “The Queen of the Night”, creates an elusive flower, blooming en masse only one night of the year. Opening slowly at dusk, the beautiful palm-sized flower wilts within a few hours of sunrise.
Tohono Chul, a non-profit botanical garden and nature preserve on Tucson’s northwest side, has the largest private collection of Peniocereus greggi in the world. Native to Southwestern North America, the cactus looks like a bunch of dead sticks most of the year, only revealing its spectacular flower in the heat of the early Tucson summer.
Since the cactus cannot self-pollinate, the plants must bloom on the same evening to ensure pollination, usually by hawk moths. The more blooms that are open, the greater the chances of pollination. The true mystery of the Night Blooming Cereus is how the majority know when to bloom.
“We’ve been studying the NBC for over 20 years now, and we still don’t know what triggers the bloom. The best we can figure is there is some type of chemical communication amongst the cacti,” says Lee Mason, former Director of General Services for Tohono Chul.
Tohono Chul planted and cultivated many of the cacti, and others grew naturally on the grounds, creating an amazing collection. Thinking it was a shame that the gardens were closed while these rare flowers were blooming, it was decided to stay open late for a few volunteers and their friends. It’s since turned into an annual event with thousands of people attending each year.
And that’s no small feat considering Bloom Night cannot be called until between 12 pm and 4 pm the day of the bloom. “We usually have a pretty good indication within a few days of the bloom, but they’ve tricked us before, so we wait until we’re positive to make the call”, says Mason.
Upon the official bloom call, Tohono Chul galvanizes its forces, contacting dozens of volunteers to help light the desert paths and organize tours, the media is contacted, and local news crews descend upon the Park, and the local populace changes its dinner plans to attend.
“It’s incredible how the entire community immediately reacts once Bloom Night is called, “ says Marcia Ring, Tohono Chul’s former Marketing Manager, “This has truly become the quintessential summer event in Tucson, which, considering the uniqueness and beauty of the bloom, isn’t surprising”.
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