In Partnership with the Southern Weekend

Tohono Chul prepares for its’ 28th annual BLOOM NIGHT

(Courtesy of Karen Wright and Tohono Chul Park)

The Mass Blooming of The World’s Largest Collection of Peniocereus Greggii is almost here!

Every summer thousands of Tucsonans visit the gardens at Tohono Chul to catch a glimpse of the majesty and beauty of the Queen of the Night, the night-blooming cereus Peniocereus greggii. When the summer heat begins to build, the buds of the Sonoran Desert native night-blooming cereus begin to appear. After a period of start-and-stop growth, the buds blossom in a mass blooming on one night.

(Courtesy of Karen Wright and Tohono Chul Park)

Since the cactus cannot self-pollinate, the plants must bloom on the same evening to ensure successful pollination, usually by hawk moths. The more blooms that are open, the greater the chances of pollination. “We’ve been studying the night-blooming cereus for over 20 years 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, Director of General Services for Tohono Chul. Bloom Night is no small feat considering the event cannot be called until the day of the bloom.

(Courtesy of Tohono Chul Park)

Although the exact night is still unknown, Bloom Night guests will experience the magnificent Peniocereus greggii in its full glory with illuminated trails leading to each plant, delectable bites and refreshments from The Garden Bistro, lectures, and the chance to win or purchase a Queen of the Night.

Tickets are available at the door for $5 for non-members, and admission is free for members and children under 12. Visit to sign up for email alerts, so you can find out the night of the bloom the minute they call it.

(Courtesy of Tohono Chul Park)

Bloom Night attendees are encouraged to:

  • Wear closed-toe walking shoes
  • Bring a flashlight
  • Stay hydrated
  • Bring a camera with a flash

For more information about Bloom Night visit: or call: 520-742-6455.