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From Plants to Steel Pipes – Nature’s Fabulous Ice Extrusions


Unless you live in a tropical country, finding snow in one’s porch is anything but unusual, but when it comes to seeing ice extrusions, that could be one for the books.

A certain business owner from southwestern Connecticut named Carl tweetedabout ice extrusions surprising his friend from Provincetown, Massachusetts, one February morning.

Those “cool ice formations,” wrote Carl, appeared on the fence at the deck of his friend’s house after an “ice storm.”

Ice extrusions occur when the temperature is below freezing (0° Celsius or 32° Fahrenheit).

Carl uploaded four pictures of them taken by his friend (one of the pictures is the one posted below right after the video).

So, what are these ice extrusions and do they just pop out of a fence?

Extruding Ice From A Steel Pipe- Time Lapse

Ice Extrusion

Ribbon-like ice extrusions from a black metal fence
Ribbon-like ice extrusions from a black metal fence

Have you already seen a pastry chef or a baker adding icing on a cake using a piping bag? See how the icing comes out of it? That gives an idea of what extrusion is.

“Extrusion,” as defined by Cambridge Dictionary, is “something formed by being forced or pushed out, especially through a small opening.”

In the case of ice extrusions, apparently that “something” extruding from an opening is ice.

Though in the process of ice extrusions, ice gets literally formed, they are different from ice formations.

According to Encyclopedia Britannica, ice formation refers to “any mass of ice that occurs on the Earth’s continents or surface waters.” Some examples of ice formations include icebergs, ice sheets (the world’s largest ice formation), glaciers, and sea ice.

Before his passing, Dr. James Richard Carter (1937-2019), a geoscientist and professor emeritus of Geography-Geology at The University of Texas at Dallas, wrote about ice extrusions. He researched about those extrusions from objects as well as those from plants, both of which are natural occurrences, by the way.

In an article for the Illinois State University, Dr. Carter said that he first saw ice extrusions in January 2007 from the pictures sent to him, which were photographed on Vancouver Island in Canada.

Three of those pictures are the one found below:

Three instances of ice extrusions, with the middle and right showing curved ice ribbons
Three instances of ice extrusions, with the middle and right showing curved ice ribbons

As you can see, the metal fence has a hole – a slit – where the ice gets extruded.

Dr. Carter explained how ice extrusions from a steel pipe happen:

(a) First, a certain amount of water somehow gets inside the steel pipe.

(b) Second, at one given night (for example only), that water starts to freeze – but not totally solidify.

(c) Third, come morning, some of those that became ice begins to melt. Now with a presence of water, those ice that didn’t melt starts to float.

(d) Fourth, come nighttime again, the temperature dips. The water freezes again and turns to ice. Science tells us that water expands when it freezes. So, during the expansion, those ice that didn’t melt during daytime and stayed in their frozen state gets pushed out through the slit/opening. Now that sounds like the Cambridge definition of “extrusion,” right?

As the ice gets extruded, it turns into an elaborate ribbon of ice as soon as it gets exposed into air. That also explains why ice extrusions are also called ice ribbons.

See how two ice extrusions from a steel fence appear in the two pictures below:

Ice extrusions from a steel pipe forming indicate ribbons of ice
Ice extrusions from a steel pipe forming indicate ribbons of ice

Dr. Carter noted that the temperature affects the brittleness of the ice extrusions. The colder the temperature gets, the more brittle they become, according to Gigazine.

Ice Flower

A tissue paper-like ice flower among leaves and twigs in a forest
A tissue paper-like ice flower among leaves and twigs in a forest

Ice flowers are simply ice extrusions from plants.

According to Wikipedia, other terms for ice flowers are:

(a) crystallofolia

(b) ice blossoms

(c) ice castles

(d) frost faces

(e) frost flowers (the one more frequently used)

As for the types of ice flowers (or ice extrusions in plants):

(a) ice ribbons (other terms: rabbit frost; rabbit ice)

(b) needle ice (other terms: frost column; frost pillars)

In a paper for the Journal of Geography and Earth Sciences and published in 2021, Dr. James Richard Carter clarified that the scientific community doesn’t use the term “frost flower” to refer to ice extrusions. The former has long been designated for something else.

Frost flowers are flower-shaped ice crystals that are formed during winter in sub-zero temperature (when it gets nearly -22° Celsius or -7.6° Fahrenheit), according to BeautifulNow. They grow “when the air is at least 15 degrees cooler than the ice.”

As water vapor comes out from the cracks in a frozen surface of a body of water, the air near these cracks starts to freeze. Then ice crystals begin to form vertically until they appear like a white flower in full bloom as can be seen in the picture below:

Hundreds of frost flowers floating on the Beaufort Sea near Alaska
Hundreds of frost flowers floating on the Beaufort Sea near Alaska

Ice flowers are formed when the air is above freezing temperature but the ground (the soil) remains to be moist because it’s still below freezing temperature. Water and sap (or plant juice) flow through the stem of a plant.

Because the stem is exposed in cold air, the water and the sap get frozen, causing super tiny cracks to appear on the stem. They get forced out – extruded – from the stem, and once they hit the air, they transform into ice flowers. They become those spiraling, curving, dancing ribbons of ice.

In an article he wrote for American Scientist, Dr. Carter calls the process behind ice extrusions as ice segregation.

Are Frost Flowers Real?

An elaborate ice extrusion from a frostweed among dried leaves in a forest
An elaborate ice extrusion from a frostweed among dried leaves in a forest

To begin with, frost flowers are not flowers at all, and, as Dr. James Richard Carter stated in American Scientist, “they do not form in the same way as frost.”

What’s definite is that they’re naturally (and intricately) formed ice – or ice extrusions.

When not referring to the “original” frost flowers previously mentioned, the “other” frost flowers point to ice flowers.

According to Dr. Carter, there are 40 species of plants that produce ice flowers.

The most common one is the frostweed (scientific name: Verbesina virginica; other names: white crownbeard, wingstem), which belongs to the family of daisies.

Other ice flower-producing plants are the following:

(a) common dittany (other names: Cunila origanoides; American dittany; frost mint; stone mint)

(b) longbranch frostweed (other names: Helianthemum canadense; Canada frostweed)

(c) yellow ironweed

Autumn/Fall is the season to look for ice extrusions in flowers.

At Run Wild My Child, a website geared towards “kid-friendly” trips and outdoor activities, Sara Lesire shared where to look for ice flowers.

“I often find them in areas that are mossy, forested, or near a creek,” wrote the Missouri-based civil engineer.

Lesire added that “a field near the edge of a wooded area” and “parks with heavy woods, mossy hills, and streams” are also ideal places to look for them.

The perfect time to search for ice extrusions, according to her, is “soon after sunrise.”

Frost Flowers 2


These ice extrusions have been found fascinating and intriguing at the same time since the 1800s, according to Dr. Carter.

“A natural, sub-zero, 3D printer,” as Hacker Newsuser “hatware” described an ice flower.

From ice spikes – or what Ontario-based naturalist and writer Seabrooke Leckie calls as “icicles in reverse” – to ice jellyfish, it seems that nature will never cease to amaze people.

Ice jellyfish (they don’t sting!), by the way, are ice formations that look like, well, jellyfish. They were sighted on the shore of Okanagan Lake in Canada in early December 2021, reported Penticton Western News.

When it comes to ice formations, the delicate beauty of ice extrusions from fences and ice flowers is one to beat.

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Xander Oddity

Xander Oddity- Xander Oddity, an eccentric and intrepid news reporter, is a master of unearthing the strange and bizarre. With an insatiable curiosity for the unconventional, Xander ventures into the depths of the unknown, fearlessly pursuing stories that defy conventional explanation. Armed with a vast reservoir of knowledge and experience in the realm of conspiracies, Xander is a seasoned investigator of the extraordinary. Throughout his illustrious career, Xander has built a reputation for delving into the shadows of secrecy and unraveling the enigmatic. With an unyielding determination and an unwavering belief in the power of the bizarre, Xander strives to shed light on the unexplained and challenge the boundaries of conventional wisdom. In his pursuit of the truth, Xander continues to inspire others to question the world around them and embrace the unexpected.

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