Jack-in-the-Pulpit, and Jill

by Green Deane

in Miscellaneous, Plants, Roots/Tubers/Corms


Arisaema triphyllum: Jack and Jill and No Hill

For a little plant there’s a lot to write about with the Jack-In-The-Pulpit. Where does one start? What does its name means? How about its ability to change sex?  And of course the misinformation about it on the Internet. Let’s cover it all.

The name “Jack” has many meanings. One is a nick name for John. Another means “male” as in jackass. It has also be used for sailor (Jack Tar) Steeple Jack (laborer) Jack of all Trades (a man who does nothing well) and Jack-O-Lantern who used to be the fellow who went through town carrying a lamp while crying out the time and curfews. Jack has also been a common term for the Devil. And so it fits with Jack-in-the-pulpit, a little plant with a devil hiding and mighty toxic sermon if not prepared correctly.

As for sex… the plant is a switch hitter, Jack sometimes, Jill sometimes. And as foragers we should know the difference because the edible part of the plant — when prepared correctly — differs between he and she.

Jack-in-the-Pulpit corms

Jack-in-the-pulpits are perennials and grow each season from a corm, kind of like an onion. They can live to 100 years old. The shoot will have one stem or two. Each stem usually has three leaves if we are referring to the Arisaema triphyllum.  The pulpit, or spathe, is green, with white, brown or purple stripes.  The minister, or spadix, is usually a pale cream spike inside.

These plants are either a Jack or a Jill.  If you open the flower and look inside the female has a developing cluster of tiny green berries. The male does not. What difference does it make?

If the corm is packed with nutrients the plant will produce a spathe for a female flower with, usually, two stems for a total of six leaves. If the corm is young or depleted it will produce a spathe for a male flower, one stem and three leaves. This is not always true but is a common display.

If you find a female plant early in the season this tells you there should be a good size corm below — up to three years of storage in fact. If you find a male at the beginning of the season that tells you it is either a juvenile or was a female last year and the corm smaller.  So you don’t want to dig up the male early in the season but rather late in the season after he’s had several months to collect up energy in the corm. You don’t want to dig up the female late in the season but rather early. Exceptions: Very young plants with no corm tend to produce one stem and are small. In fact, most male Jacks are under 14 inches tall. Most Jacks over 14 inches tend to be Jills.

The berries burn, too

To recap: If the plant has one stem and three leaves it’s usually a male, two stems and six leaves a female.  Generally he has bigger corms at the end of the season, she has bigger corms at the beginning of the season.  You can also look down inside the spathe and tell if it is a he or a she. She will be making green bumps that will be future red berries. And what of that corm that the Indians called the “fire ball?”

In its raw state chewing on a corm will “burn” your mouth and swallowing it will poison you, while painfully probably not fatally though you may have a rash of kidney stones, which can make death seem a pleasurable alternative. The offending chemical is needle-shaped calcium oxalate crystals called raphides (RAF-ee-dees.) They stings painfully. If you manage to swallow untreated corms the raphedes can “precipitate” in your kidneys, which is a fancy word for clogging them up. So don’t try to eat the corms raw. Don’t eat them dry if they produce a burning sensation in your mouth. The goal is to make them burn-free before consumption.

Plant showing spathe

Calcium oxalate, at the very least, causes intense discomfort. Tiny amounts can create the sensation of burning. In some cases it can lead to swelling of the throat and closing off of air. In larger doses, it can cause severe digestive upset, convulsions, coma, and death. Recovery is possible, but permanent liver and kidney damage can happen. The worst part is the effect even in the mouth can be delayed for a few minutes. This is why you must always try only a little after preparing it, chew it, spit it out, and wait ten minutes or more.

Scores of Internet sites that copy each other say boiling the corms makes them edible. That is very misleading.  When I read that I know the writer has never boiled a corm then tried it. I have boiled potato chip thin slices up to six hours and still had them burn some. Maybe at 12 hours, or the two day mark they stop burning, but for a third of an ounce of starch it is not cost effective.

I traced the boil comment back first to 1916 in an article by National Geographic Magazine, then to a Scottish book in 1875 called The Wealth of Nature, our food supplies from Nature. In the article about “Common American Wild Flowers” it talks on page 590 about “boiling the bite” out of the corms. But the writing style is affected and I think the phrase used for its assonance sound than its accurate information.

The 1875 book, referring to the family in general. says an “Indian plant” can be roasted or boiled. There also some references in other places to boiling the corms and then drying them. Someone may have presumed boiling was making them edible and drying was for storage. At any rate, the mistake is entrenched. Boiling for a day or more may work but I know for absolute certainty several hours does not do it. Drying is a far better choice.

Raphides of calcium oxalate

Many “edible” plants have calcium oxalate and boiling them doesn’t get rid of it for them either, wild taro roots in Florida, for example. Why should it be different for Jack-in-the-Pulpit?  Dry heat breaks down the calcium oxalate. Short-term moist heat does not. Let me succinct: Slice thin then air dry for three months or more. Slice thin and dry in a slow oven for three to seven days or so or in a food dehydrator.  One other option is to put them in the microwave.

While my results varied. I have made some sliced corms edible after 3 minutes in my microwave, but some were still burning at five minutes, and 10 minutes tends to incinerate them, unless whole. Clearly air drying is the cheapest and produces the sweetest product. Nuking them produces a cooked nutty flavor but they go from edble to burnt crisps in seconds.

I’ve also sliced and dried them in my solar oven which reaches around 325F. It takes about three days of trying, 15 hours, to get them edible, and little energy is used. And all those times are precautionary times. Your times can certainly vary so carefully try your slices before consuming. Here’s how you do that.

To test them: Chew a quarter-inch square piece on one side of your mouth for a full minute then spit it out and wait ten minutes. And I mean chew for a minute and I mean wait ten minutes and I mean one side of your mouth (to limit the area that burns.)  The effect can be quite delayed. If the calcium oxalate is still present it will make one side of your mouth burn, and your tongue and lips. That can last up to a half an hour or so. If no burn, try a bigger piece the same way. If no burn then, you’re ready to go. You can eat the dry chips as is, or grind them up as a flour. If you air dried them they can be used as a thickener. If you dried them at over 150F they can be used as a flour but not as a thickener because the starch will have already been cooked.

Arum maculatum

In a 1906 book (Studies of Plant Life in Canada by Catherine Parr Strickland aka Mrs. C.P. Traill — yes, two l’s)  she refers to a European relative of the Jack-in-the-Pulpit, the larger Arum maculatum, also called Cuckoo Pint. They were dried thoroughly then pounded or ground then tossed into water where the starch settled, a similar process to extracting starch from the cattail root. That starch was then pounded or ground a second time and put in water again. This was done until the visible impurities were all removed (the calcium oxalate already removed by drying.)  Then the water was poured off and the starch allowed to dry. She reported a peck of roots created a pound of starch. That starch was one time called Portland Sago, from Portland Island in Dorsetshire, England.  It was used like saloop, a drink popular in England in the 17th and 18th centuries before coffee and tea were imported. Ground A. maculatum powder was added to water until it thickened. Then it was sweetened  and flavored with orange flower or rose waters.  Because it would thicken it was also used as a substitute for arrowroot. However, the powder used for saloop and as an arrowroot substitute was from dried not roasted corms since roasting would cook the starch rendering it not useable as a thickener (the same issue with acorns. To use them as a thickener or binder they must be processed without cooking, that is, under 150F.)

Arisaema dracontium

Catherine Parr Strickland then returned to North America in her book with the comment: “When deprived of poisonous acrid juices that pervade them, all our known species may be rendered valuable both as food and medicine; but they should not be employed without care and experience.”

Now, what about the berries? I have not tried them and they are listed as toxic, probably for the same reason the corms are. There are some references that say the totally dried berries are edible but I have not tried them so I cannot recommend them.

Besides careful humans the only other creatures to find food from the plant are Wild Turkeys and Wood Thrushes who eat the red berries. Those berries, by the way, were used by Indians to make red dye. (And early settlers used the starch in the corms to starch their clothes.)

The plant, for all its warnings, is also a pain killer, as reported by Dr. Daniel Austin in his book, Florida Ethnobotany:

“When I was a professor in Florida, a mother and her young son came to me for “advice” about a science project that the boy was doing. He had apparently discovered independently that juice from the live plants applied to wounds stopped the pain. Since he was still in grade school, it seemed unlikely that he had scoured the old literature and learned that the natives of North America used the sap in the same manner. Regardless, he was doing an experiment that involved getting as many volunteers as possible to prick their finger with a needle and then apply juice directly from the plants. I, too, became one of his subjects with plants that they had imported from New England. We dutifully cleaned the instruments, drew the blood from the end of my finger with a needle, and then applied the juice. The pain stopped immediately upon contact with the liquid. They told me that each person they had tested had exactly the same reaction….”

The scientific name for my local Jack-in-the-Pulpit is straightforward. Arisaema  (ar-ih-SEE-muh)  is a combination of two Greek words, “Aris” or “aridos” which was a name used by Pliny for a small herb thought to be in this family, and “hiama” or “haimatos” meaning blood as some of the species have red/purple spots or stripes. Triphyllum  (tree-FIL-um) means three leaves.  There is a bit of a botanical argument where there is one species and variations or three species, or more. Incidentally, the A. dracontium (dray-KON-tee-um)  is used the same way. It has a long tip to its spathe and a different arrangement of leaves.

Green Deane’s “Itemized” Plant Profile

IDENTIFICATION: A flap-like spathe curves over the top of a funnel-shaped spadix. It can be green, purplish or striped. Leaves are long, ovate, usually three per stem. Fruit inside spadix looks like a cluster of little eggs, green at first later scarlet red. Corm is walnut-sized or larger, can have brain-like folds..

TIME OF YEAR: While available year round, gather in the fall or early spring or when dormant. Store in damp sand.

ENVIRONMENT: Likes moist forests and shade, bottom land, damp soil but not waterlogged.

METHOD OF PREPARATION: Only dry heat degrades the calcium oxalate crystals efficiently. Slice thin, dry for three months (in the sun is even better) or in a slow  oven or dehydrator for about five days.  In my experience boiling takes in excess of eight hours to make them approaching edible.  Once cleared of the acid the corms can be used like arrowroot or flour depending on how hot it was heated.


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{ 22 comments… read them below or add one }

Chris Chone May 24, 2017 at 17:46

Are there any ways to prepare them for direct consumption, such as roasting or frying?

If not, I could experiment and let you know what results I come up with.


Green Deane May 24, 2017 at 17:56

Not that I know of. The microwave was the closet I got to that.


mark jr. April 21, 2017 at 14:12

ethylenediaminetetraacetic acid (EDTA) is a relatively harmless acid that when added to water increases the solubility of calcium oxalate dramatically. One could theoretically prepare a solution of EDTA to submerge shredded jack in the pulpit roots and agitate to dissolve as much calcium oxalate as possible. Then repeat the step until the calcium oxalate is mostly dissolved. Wash the shredded roots with warm water until there is very little to none EDTA left. EDTA, however, is slightly mutagenic to mammalian somatic cells so it would not be a good idea to eat to much of the root matter. This method would be much faster then any of the previously proposed methods of rendering Arisaema triphyllum edible. this method is not particularly economical as 100 grams of pure EDTA will cost $26.20. This method would certainly be the most consistent method.

works cited
-Writer, Leaf Group. “How to Dissolve Calcium Oxalate.” Sciencing. Leaf Group, n.d. Web. 21 Apr. 2017.
-“Research Essentials – Product Catalog, Sigma-Aldrich.” Sigma-Aldrich. N.p., n.d. Web. 21 Apr. 2017.
-msda on calcium oxalate


mark jr. April 21, 2017 at 14:14

‘msds’ not “msda”


john anthony hunt February 5, 2017 at 08:43

I live in eastern Ontario where jack in the pulpits were abundant in the 1950’s thru 1970’s but now there none. I look every spring in locations where they used to thrive when I was young..but there are none. Wondering what has happened but cannot find any answers ???


john anthony hunt February 5, 2017 at 08:44



Green Deane February 7, 2017 at 17:35

Could be cyclical or they are changing sex and laying low.


JRRBLL October 2, 2016 at 22:41

…Nice Article on this Wonderful plant….One more thing from personal experience, Be Sure to Wash your hands after handling the corms or plants, certainly Before you pee in the woods…..Burns result in places you will not like, if you are Not careful…


ben July 25, 2015 at 17:05

My mouth burns!!!… but I’m okay, I didn’t swallow.


Green Deane July 27, 2015 at 10:09

Lime or lemon juice works well to reduce the burn.


Mike Talley September 21, 2014 at 00:34

I have been playing with some Jack-in-the pulpit berries from Iowa. A mixture of unsweetened chocolate and semi-sweet chocolate in the ratio of 2:1 mixes well with a SMALL amount of Jack-in-the Pulpit berry juice in the ratio of 1 part juice to 6 parts chocolate mix. The slight hint of calcium oxalate adds a delightful after taste reminiscent of wasabi, but a little goes a long way! Feed back would be appreciated!


Green Deane September 21, 2014 at 05:32

Finding a way to mask calcium oxalate is avoiding what the plant is trying to do, keep you from eating it. I think it is safer to degrade the chemical than mask it.


Bill Brighoff September 9, 2014 at 10:42

As a youngster, I once bit a Jack-in-the-pulpit stem so I could take the flower home. I only did it once.


Molly Williams September 8, 2014 at 13:18

Can the leaves be eaten? By other animals than humans? I keep finding just the red berries here in NH in Sept., on a simple stalk with no leaves attached, and I’m wondering if someone (mammal or otherwise) is eating the leaves. The plants in my yard and along other trails in town still have their leaves, still green and completely attached, but not any of the plants along one wooded trail in town. Curious. Thanks for a very informative page on this plant.


Teresa Rammer August 27, 2014 at 11:21

My grand daughter just eat a green berry. Is there something we should be giving her or does she need to go to the doctor? She said her mouth is burning.


Green Deane August 30, 2014 at 12:37

I’m sorry I did not see this sooner. It depend more on her size than anything else per se. The burning is calcium oxalate which can be mitigated some with lime juice or lemon juice. A small amount is just a topical irritant and will go away. If one manages to eat a good amount of it the chemical can cause kidney problems but usually most people can’t eat enough of it to damage the kidneys because it burns the mouth too much. If one manages to swallow some then it become a guessing game as to how much calcium oxalate and how small or big the person. While it is an issue it is not a chemical which in modern times poses a death threat.


Betsy Rondeau June 14, 2014 at 22:08

I really enjoyed the information you have shared on Jack in the pulpits. I live in MA and we have several in the yard. I dug one up in the spring and moved it under a tree and it is doing well. We have about 10 , a few are close to 3 feet tall, and they are in the sun a good part of the day.

When talking about the male plants, do they just have the 3 leaves? If so, how do you get them to be female ? I have them in the woods, and they look like Jack in the pulpits, but I am unsure.


Green Deane June 14, 2014 at 23:17

They change sex on their own.


Cindy November 17, 2013 at 18:54

Dear Green Deane,
My mother has recently passed away I and wanted to dig up her beloved Jack-in-the-pulpits to bring to my home flowerbeds. But today as I used a garden fork to gently search through the spot they always grew in, I could not find any bulbs or roots. The soil was loose and I went through it by hand examining the soil between my fingers to search for anything resembling a bulb or root. I’ve been transplanting and gardening for over 25 years but have no experience with Jack-in-the-pulpits. And so tonight I’ve gone online to search for info- one site said it is a bulb like root and to plant them only one inch deep. I turned over the soil about 8 inches down looking for the bulb/root. I really appreciate your photo of the corms but I don’t see any mention of size. Are they pretty small? I’m hoping to find them soon before the ground freezes here in northeast Pennsylvania. I’m hoping i can still find them after all the digging and handsifting I did earlier today. Please email me any helpful advice you can offer.
Thanks so much for your time & any help.
-Cindy L.


Green Deane November 17, 2013 at 19:33

You can’t wait until spring to transplant them after the show themselves?


Robert August 21, 2013 at 15:46

Thanks for the good information . on jack in the pulpit . I once as a boy read a book called ( My Side Of The Mountain) In the book he ate these corms but i thought he boiled them. i once dug one when out hunting and took a bite and chewed it a bit and spit it out and It began to burn so i thought if thats what they taste like I would rather eat nettle much tastier and now I have read your post nettle may sting at first eaten raw but it sure tastes better and less trouble if your just looking for somthing to munch on quick.


richard May 5, 2013 at 23:08

Thank you for this very informative reading on jack in the pal put plant.


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