Garden Dilemmas, Delights & Discoveries, Ask Mary Stone, New Jersey Garden blog

Fascinating Anomaly of Fasciation

an elongated dark brown center of a black-eyed Susan with bright yellow petals.

Hello fellow readers. I enjoy being stumped by mysterious and sometimes magnificent garden dilemmas. Dorrie of Lebanon, CT, found my previous column about Deformed Flowers on Black-eyed Susan. The culprit— insects and a pathogen named Aster Yellows Disease (link below). But I had never seen artful, extended centers of Rudbeckia and Coneflower (Echinacea) such as those in the photos Dorrie sent. It turns out to be the fascinating anomaly of fasciation.

an elongated dark brown center of a black-eyed Susan with bright yellow petals.

Dorrie’s Black-eyed-Susan (Rudbeckia) with fasciation.

She writes, “a couple of stocks on one of my Black-eyed Susan plants are wide, and the blossoms have weird, elongated centers. I was showing my sister, and when she got home in Vermont, she found a few on her Coneflowers. It’s odd because the entire plant isn’t infected, just a stem of two. Do you have any idea the problem?”

Fasciation is not a problem at all.
an elongated center of a mauve coneflower with fasciation

Coneflower (Echinacea) with fasciation.

After reaching out to two favored puzzle-solvers and digging deeper into the dilemma, it turns out it’s not a problem at all, but a beautiful anomaly called fasciation.

Lynn Waclawski of Warren County’s Rutgers Cooperative Extension writes, “I have never seen it before! It’s sure unique looking. If you do not see any symptoms of Aster disease, maybe it’s just some crazy mutation. Go ahead and get a lottery ticket now :^).”

I should note that if weedkillers or herbicides drift into your garden, it can cause deformities in the new growth of plants; one of the reasons I forgo them. But If there’s no evidence of chemical damage, it’s likely fasciation. At the risk of getting too scientific, not my forte, I’ll describe it like this:

Fasciation is an unintentional genetic modification.

The meristematic cells of plants develop into the various parts of a plant – stems, leaves, or flowers. With fasciation, the cells flatten, causing stems to broaden or flower centers to spread out looking as though it’s two-headed. It can also cause an overabundance of leaves and flower buds in areas of the plant.

The “mistake” is like an unintentional genetic modification—a defect in the DNA code.  Or it could be caused by insect damage or viral infection. It’s most noticeable in stems— looking like flattened ribbon-like stems, twisted stems, or bushy growth. And blooms—often looking like two flowers fused much like conjoined tomatoes or squash.

Siamese twin yellow summer squash also known as conjoined squash or fruit

Dotty’s Siamese Twin Squash

What causes conjoined vegetables and fruit anyway?

Speaking of, a lifelong friend Dotty of Fishkill, NY, posted a Siamese twin yellow squash on Facebook. They appear to have grown together because they were too close to each other on the stem. But it’s a result of pollinators fertilizing two of the flowers’ ovaries instead of one. I’ve read it occurs about as often as sets of twins.

a scarlet red blossom of a Celosia flower intentionally propagated with fasciation

Cockscomb- Photo Attribution: Lumaca, CC BY-SA 4.0  via Wikimedia Commons

Some plants are cultivated to have Fasciation.

I like to think of these things as magical mutations, not a mistake. Fasciation is not contagious nor likely to come back again on the same plant.

However, plants are cultivated to have fasciated blossoms and stems, such as cockscomb, an annual here. Celosia argentea var. cristata (formerly Celosia cristata) is a fuzzy favorite with unusual scarlet combs that are crumpled and lobed. In the case of cockscomb, the fasciation passes along to the next generation in the seeds.

So, unless you see signs of disease, Dorrie, enjoy the artful, slightly freaky, and fun anomaly. Mother Nature can be so clever. Garden Dilemmas? (and your favorite Podcast App.)

Related Column Deformed Flowers on Black-eyed Susan

And tune in to the Garden Dilemmas Podcast featuring this story.


Mary Stone, owner of Stone Associates Landscape Design & Consulting. As a Landscape Designer, I am grateful for the joy of helping others beautify their surroundings which often leads to sharing encouragement and life experiences. These relationships inspired my weekly column published in THE PRESS, 'Garden Dilemmas? Ask Mary', began in 2012. I dream of growing the evolving community of readers into an interactive forum to share encouragement and support in Garden and Personal Recoveries - seeking nature’s inspirations, stimulating growth, weeding undesirables, embracing the unexpected. Thank you for visiting! Mary

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