When Does Saguaro Cactus Bloom

Phenology is the study of periodic events in the life cycles of plants and animals, such as springtime bird migration or the time of year when saguaro cactus bloom and bear fruit. When saguaros reach a height of around 2.2 meters (7 feet), or when they are 30-65 years old, they attain reproductive maturity and produce their first flowers. The latter two weeks of April are when saguaro flowering starts, and the last week of May through the first week of June is when it reaches its height.

Winter rain, longer days, and warmer temperatures in the spring all contribute to the saguaro’s blooming. Late June or early July is usually when the fruit turns a deep red color. In anticipation of the summer rains in July and August, they scatter countless numbers of tiny seeds.

Saguaro Flowers

Saguaro flowers are typically found close to the apex of the cactus’ stems and arms. They have a diameter of around 3 inches (8 cm) and are white in hue. They smell strongly, somewhat like ripe melons.

Flower pollination

The Mexican long-tongued bat and the lesser long-nosed bat pollinate the blooms at night. Bees and birds like the white-winged dove fertilize the flowers during the day.

Saguaro Fruit

The blossoms develop into brilliant crimson fruit after being fertilized. The fruit splits open to reveal luscious red pulp as it ripens. Up to 2000 tiny black seeds can be found in each berry.

Uses of the fruit

Many desert animals rely on ripe fruit as an excellent source of nutrition and moisture. Finches, woodpeckers, doves, bats, tortoises, javelinas, and coyotes are a few of these creatures. People consume saguaro fruit as well. Since they have inhabited the desert, Tohono O’odham Indians have been gathering the fruit.

Quick Fact

Less than a day is spent in bloom on saguaro flowers. They start operating at night and are open all day the following day. They only have that brief period to entice an animal to pollinate them.

Do saguaro cacti flower annually?

Possibly while traveling through Tucson during the past few weeks, you observed that our beloved saguaros have adopted new hairstyles.

The bulbous green nubs on their heads are actually buds that will soon open into stunning saguaro flowers at this time of year, so don’t think they’re growing baby avocados at the top of their heads (you’ll still have to pay extra for guac, sorry).

Here are some details on these white dazzlers and why they are so significant to the Sonoran Desert that you might find interesting.

1. Early May to early June mark the peak flowering period.

But don’t be deceived by that period of time. According to this Arizona Daily Star story by Doug Kreutz, saguaro flowers can be found for more than half the year. This year, blooms have been observed as early as mid-April, while they weren’t seen until November last year.

2. They live a brief life.

According to John Wiens, a gardener at the Arizona-Sonora Desert Museum, saguaro blooms normally bloom at dusk and remain open until about midday the following day. The bloom will be over by the time the flower begins to wilt in the afternoon.

3. A single saguaro can bloom up to 100 times in a single season.

4. They receive some assistance from their pals.

The pollination mechanism for the saguaro bloom depends on a variety of desert-dwelling creatures, such as bees, moths, hummingbirds, and white-winged doves. These animals pick up pollen as they consume nectar from the bloom, which is then carried to and deposited in other flowers.

5. But the bat is their lifelong best friend.

Because they co-evolved, smaller long-nosed bats and saguaro flowers are a marriage made in pollination heaven. As these lovely blooms blossom at night, this is the perfect moment for bats to utilize their brush-tipped tongues to collect copious amounts of honey from the flower. These blooms’ stark white visibility also makes them simple for bats to identify as they fly through the gloomy desert sky.

What month does Arizona’s cactus bloom?

Despite the fact that wetter years result in more flowers, they bloom nicely almost every year. In April, you can view the widest variety of spring-blooming plants. Early May sees the blooming of the numerous prickly pears, and mid-May to mid-June sees the blooming of the saguaros, continuing the cactus display.

When do cactus flower?

Cacti are often blooming plants. As a result, practically all cactus species have the ability to flower when they are grown and in the proper environment. How old your cactus plant is and how well you take care of it will determine whether or not it blooms. Some cacti plants flower when they are very young, but others won’t bloom until they are at least 30 years old.

Then, how frequently do cactus flowers bloom? Cacti plants typically bloom at least once each year, while wetter years could result in multiple flowering times. The majority of cacti species bloom in the spring when the climate is nearly ideal. In April, you may witness the widest variety of spring-flowering cacti species. Some species, like the prickly pears cactus, bloom brightly in early May, while others continue into May. Most saguaros bloom between mid-May and mid-June.

How can you tell when a cactus will bloom?

The majority of blooming plants produce their flowers from the top or side of the plant, but certain species may produce flowers on one of their sides. For instance, prickly pear blossoms are seen on the stem’s side.

-While some plants can have both hues, the blossoms of most plants are often a different color than the plant itself. For instance, the pink and white petals and green foliage of the saguaro cactus.

-While some plants just have a single blossom on them, others have little, clustered flowers. Prickly pear, hedgehog, and organ pipe are three common cactus species with clustered flowers.

-While certain species of cactus bloom more like a closed ball, the flower will have petals that allow the blossoms to expand up. A barrel, hedgehog, and candelabra are examples of common cacti with this propensity.

When attempting to predict how well a cactus will flower, you may also check to see if its flowers are open or closed by seeing whether they are.

The best way to tell is to check your plant for buds before any indication of a bloom appears. It’s doubtful that your cactus will bloom if you have no buds.

-Remember that a variety of elements, such as the plant’s environment and exposure to light, can influence when it blooms.

Cacti are really delicate plants, therefore if you don’t take good care of them or give them adequate water, they might not flower. Additionally, make a note of things like seasonal fluctuations and temperature variations.

-If the species of your cactus is one that flowers readily, such as a barrel or hedgehog, you may predict if it will bloom by looking at its flowering season.

-Looking for particular kinds of blooms and buds on the plants itself is another technique to determine whether your plant will bloom.

A cactus can develop without blooming, suggesting that it might eventually be able to produce flowers. In these situations, it is preferable to maintain the plant’s health to enhance its chances of blooming.

-Waiting until your cactus flowers is the simplest approach to determine if it will flower, but there is no assurance that you will receive flowers if you do so.

-Before establishing a new cactus, take care to select one that will be simple to maintain and is at the right level of difficulty.

-If you’ve owned your plant for a while (more than a year), it can be worthwhile to talk to someone who is knowledgeable about plants, such as a cactus botanist. By doing this, you will be able to determine whether your plant need any extra attention to boost the likelihood that it will flower.

In order to correctly care for your cactus plant, you must understand whether or not it will flower. There are three ways to determine whether a cactus will bloom: waiting till the occasion arises, providing the plant with a healthy lifestyle, and conducting some research in advance of planting a new one. Before planting a new cactus, you should conduct some study if you are curious about whether or not it will blossom. There’s a good probability that your plant will flower soon if you’ve had it for more than six months, it’s flourishing, free of diseases, and gets the right amount of care.

How frequently do saguaro cacti bloom?

The enormous saguaro cactus in the Sonoran Desert produces one of the most exquisite flowers every spring. The nighttime blooming of the huge, white flowers with yellow centers is followed the next day by their closure. Birds, insects, and even bats pollinate them. We honor the Tohono O’odham People, who have a long-standing relationship with the saguaro through an annual fruit harvest, as the traditional owners of the lands that make up Saguaro National Park.

The park has experienced an increase in temperature of roughly 2°F over the previous century. Many people question whether the warmer weather is forcing flowers to blossom earlier than usual, which could throw the saguaros’ relationship with some pollinators out of whack.

Saguaro National Park launched a citizen science initiative in 2017 to investigate the phenology of saguaro flowers. Using a digital camera mounted on top of a 30 foot long “selfie stick,” our interns and volunteers venture out into the desert every day to capture the buds, blooms, and fruit of more than 50 saguaros. In order to better understand changes over time, we will correlate flowering dates with weather observations and historical data. We take great pride in the diversity of our volunteers, interns, and Next Gen rangers, who get support from the Friends of Saguaro National Park and the Western National Parks Association. They are all a part of the Latin Heritage Internship Program.

When does a saguaro bloom? How old is it?

Saguaros are a cactus that grows very slowly. In the first eight years of its life, a saguaro grows between 1 and 1.5 inches in Saguaro National Park, according to studies.

As they develop under the cover of a “nurse tree,” most frequently a palo verde, ironwood, or mesquite tree, these tiny, newborn saguaros are quite difficult to find. The much older nurse tree of the saguaro could perish as it grows more. Some scientists think that because the saguaro is competing with the nursing tree, it may cause it to die by stealing water and nutrients from the nearby soil.

Growth rates change with age, based on the environment, amount of precipitation, and location. We do know that a saguaro cactus grows most rapidly during the transition from an unbranched to a branching mature stage.

Typically, branches start to emerge on saguaros in Saguaro National Park between the ages of 50 and 70. Arms might not form for up to 100 years in locations with less precipitation.

A saguaro starts to produce flowers when it is 35 years old. Flowers can be found anywhere along the sides of the plant, though they are typically located near the end of the main trunk and arms. A saguaro will continue to produce flowers for its entire lifespan.

Typically, a saguaro is thought to be roughly 125 years old as an adult. It might be up to 50 feet tall and weigh 6 tons or more. A saguaro’s lifespan is most likely 150 to 175 years on average. However, according to biologists, certain plants could live for over 200 years.

Identifying Features

One of the species that characterizes the Sonoran Desert is the saguaro cactus (Carnegiea gigantea). These plants are huge, tree-like columnar cacti, some of which never sprout arms or branches as they age. There may be over 25 of these arms, which often curve upward. Protective spines cover saguaros, which also have white blooms in the late spring and red fruit in the summer.


Only the Sonoran Desert is home to saguaros. Temperature and water are the two main elements that affect growth. The saguaro can be killed by frost and cold weather if the height is too high. Although both winter and summer rains occur in the Sonoran Desert, it is believed that the Saguaro receives the majority of its moisture during the summer rainy season.


This cactus can be found in western Sonora, Mexico, and southern Arizona. They are more common on the warmer south-facing hills in the northern part of their range. Southeast California is also home to a few stray flora.


Cactus called saguaro grow very slowly. A plant that is 10 years old might only be 1.5 inches tall. Saguaro trees can reach heights of 40 to 60 feet (12-18m). When the saguaro is well-hydrated and there is plenty of rain, it can weigh between 3200 and 4800 pounds.

Quick Facts

The majority of the saguaro plant’s roots are merely 4-6 inches deep and extend outward as far as its height from the plant. One deep root, or tap root, penetrates the ground more than two feet deep.

When a saguaro dies, its woody ribs can be utilized to make furniture, fences, and roofs. Among the dead saguaros are the “saguaro boots,” or holes where birds formerly built their nests. Before the canteen was invented, Native Americans used these as water bottles.

In what month does Arizona’s desert bloom?

During the months of March and April, when the Sonoran Desert is in full bloom, locate the best places to view wildflowers in the Greater Phoenix area. There are easy and challenging hikes.

A saguaro cactus’ water supply is safe to drink.

The huge saguaro cactus, which is the most well-known cactus and has branches that resemble arms, can store up to 200 gallons of water, however this water can be hazardous to people. The prickly pear and barrel cacti are the ones that contain drinkable fluids in their soft, spongy pulp.

Where in Arizona can I see a cactus in bloom?

Although the wildflower season may be largely finished, another kind of bloom is bringing color to the desolate, dry environment. Many different cactus species have brilliant flowers that come in a range of colors and are quite stunning to behold.

Before leaving, check the websites or Facebook pages of some of these locations to see whether they are open or have changed their hours.

How many of these places have you been to when they are in bloom? Have we missed your favorite place? If you want to learn more about Saguaro National Park, let us know and read our earlier article: In this special national park in Arizona, about 2 million cacti flourish.

Are there any establishments, shops, or tourist sites in Arizona that you feel the world should be aware of? You might see your nomination mentioned in a future story, so head over to our nomination page and scream them out!