Flowers on elephant ears — colocasia

I’ve been growing Elephant ears — Colocasia esculenta — for many years. Over that period of time I’ve rarely had them bloom. They just don’t set flowers very often.

Normally when plants blossom, it means they are all set to produce seeds. Colocasia, however has been cultivated for so long, that it no longer is able to produce seeds and relies on people to reproduce. In tropical regions, people plant the underground corms like we would plant a flower bulb here in Michigan.

Colocasia is a dramatic addition to the landscape with it’s huge leaves that easily grow to three feet long in Michigan. In it’s native area in the tropics the leaves can measure six feet in length.

People in the tropics don’t grow them for their landscape, instead they eat them. There, colocasia is called taro and is a major food crop where it is used like we use potatoes here. Millions of tons of taro are harvested each year.

One winter, many years ago, I had a recent immigrant from the south Pacific visit the greenhouse where I was growing dozens of colocasia in pots getting them ready for planting out into the landscape. She recognized them immediately and asked me if I was growing them for harvest. I told her they were for planing out in the landscape as a decorative plant. She laughed and thought that was quite funny!

 

The flower bud on my colocasia is ready to open.
The flower bud on my colocasia is ready to open.

My blooming colocasia was one that I stored in my semi-heated garage over winter. I kept it in its pot and let the soil dry out. I watered it once in a while.

The plant went dormant and was exposed to some cool temperatures for extended periods of time but it never got much colder than the lower 40’s. The only light it got was low, indirect sunlight from a small garage window.

I have a theory that stressing the plant somehow triggered a flowering mechanism. The other colocasia I had bloom was about 12 years ago and that plant was stored over winter much the same way.

I’d be interested to hear if any readers have had similar experiences with their colocasia.

Bob

5 thoughts on “Flowers on elephant ears — colocasia”

  1. Hi – I just came across your post because my colocasia suddenly grew a bud and will soon flower, so I was looking for information and pictures online. I am in Virginia and this is the first colocasia I have ever grown, and it is in a large pot that I planted around May. The leaves have been as large as three feet earlier in the season, and I have sporadically fed it fish emulsion. I have not had it for a winter yet, so it has not experienced the stress you describe, unless the nursery where I bought the “bulb” did something, though I doubt it as they don’t grow them. Maybe mine is just beginner’s luck!

  2. Hi Paul, You are the first person to respond to this post saying their colocasia is blooming. My wife Judy was a Plant Collections Specialist at University of Michigan Matthaei Botanical Gardens for many, many years and rarely had one bloom. I’ve had one or two flower in the past.
    Plants are full of surprises! Thanks for sharing your experience. Best of luck to you. Bob

  3. Not sure if this is the plant I have. I have 4 separate potted plants all but one are continously blooming beautiful white flowers but the flowers grow under the big leaves and if I pull the flower out from under itsome growth is stunted and the pristine white flower will turn brown on the outside edge. I would love to know if this is the same plant or if not exactly what it is. I lost the tag after purchasing

  4. Hi Lori,
    Check under the soil to see if your plants are growing from a bulb or tuber. If they plants have large, dark-colored leaves, it is most likely the same plant or one very closely related to it.
    Thanks for checking in, Bob

  5. This is my first year growing a colocasia. I have several different sizes growing. My largest plant is about 6-7 feet tall. All the plants are on the east side of my house next to the house. I have had 2 plants bloom last week. I was surprised because I didn’t realize they would bloom. The blooms only lasted 2 days before turning dark. Very interesting plant. Have a couple of the black colocasia plants but they are only about 1-2 ft tall.

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