A Teosinte Christmas in Colorado

So, i know I’ve blogged a bit about experimentally growing Teosinte in my post about growing prehistoric corn and also in my post about differences between teosinte species. Both posts have gotten quite a bit of traffic over the years and have brought people to my blog who are interested in Teosinte specifically.

For those of you who don’t know Teosinte is a progenitor to modern Corn (Also known as Maize), which is still able to interbreed with Corn. Some teosinte is annual, while others are perennial (or maybe bi-annual). There are many people who are interested in breeding perennial teosinte with corn to make perennial or bi-annual corn.

The major problem with trying to grow Teosinte in a moderate climate as here in Colorado in the United States is that it is adapted to grow in the climate of mexico and our growing season just isn’t really long enough. Even more so since Teosinte is day-length sensitive and does not even start to tassel, silk, and pollinate until the days get short and the sunlight shifts deeper into the red spectrum. By the time that happens here it is usually around August and often we get snow by September or October. Definitely not enough time for Teosinte or Corn seeds to mature and dry down for saving. …Or is it?!

Well, this year it just happened to turn out just barely long enough. I’m calling it my Christmas miracle! haha. I think it was a combination of it being a La Nina weather year with an unusually warm fall with no snow until here in December. But also with the fact that i dug up my clump of teosinte plants and put them in a pot in the garage. Though they were a bit unhappy in the garage and were touching the ceiling.

Still i was able to keep them in there long enough to hand pollinate them. But to be honest i thought i had again failed to get viable Teosinte seeds. But when the plants were dead i went out and happened to find some! Above is a picture of what i believe to be seeds of ‘Zea mexicana’ teosinte seeds.

If there is one moral of this story that you should take away it is this: Never give up even when everyone else thinks you are crazy or tell you that what you believe is impossible. I learned this in gardening from my friend Joseph Lofthouse of Utah. He has had success with so many of his unusual crops that no one else in his valley of Utah is able to grow. He often starts with many varieties of a plant as possible and grows as many as he can. Often more than 90% of them die or fail to produce seeds. But he only needs a few that do. Once he gets seeds he can start to effort to plant them year after year and adapt them to his climate. If they still fail to thrive he lets them die or culls them off himself. But he has a variety of unusual crops, such as Landrace Watermelon adapted to Utah (and by extension Colorado), Landrace Cantaloupe, Landrace inter-species hybrid squashes, Tomatoes that are self-incompatible and are highly attractive to bees (modern tomatoes are not at all and are highly inbred), and more.


On the left here is a photo of one small cob of a teosinte hybrid (zea diploperennis-corn hybrid from the USDA) pollinated with what i believe to be flour or field corn pollen. On the right is the same teosinte-corn hybrid cob line but i believe this one was self pollinated with its own pollen. It seems to have popcorn heritage as the seeds show popcorn / flint corn characteristics.


Here is another strain of day-length neutral teosinte (decended from Zea mexicana) that a collaborator Joseph Lofthouse of Utah is growing and having success with. I believe he got the seed originally from NativeseedsSEARCH in Arizona. He decided to test if it makes good popcorn.


Here is my Teosinte clump in the summer of 2016.


Here is the same spot with snow on it now in winter.

If you’d like to follow the discussion about growing teosinte in places it is not normally supposed to grow (or other unusual crops) then visit the Alan Bishop Homegrown Goodness plant breeding forum here!

9 thoughts on “A Teosinte Christmas in Colorado

  1. Interesting. However, the perennial teosintes are truly perennial, they are not
    bi-annual/ Mine has returned for 5 years and still has not adapted very well. Native Seeds has some nice teosinte, but I question the true authenticity of their species. I have found errors in their corns before as well as contamination. The plant you have in the clump doesn’t resemble Zea mays ssp. mexicana.

    1. The teosinte in the photo is a mix of Zea mexicana direct from the USDA GRIN and two plants of a zea mays-zea diploperrenis hybrid also direct from the USDA Grin. Admittedly it is hard to tell from this photo. It was not my best year for growing teosinte. See some of my older posts on teosinte for better photos.

    2. Do your Zea diploperrennis and/or zea perrennis plants tassel and silk every year or do they tassel and silk every two years? Mine have never tasseled or silked the first year and have never survived my winters, thus why i called them suspected bi-annual. Or bi-perennial if you prefer.

      1. They silk and tassel yearly, just extremely late. The harshness of the winter depend son how strongly the plants return each year. So, they are still true perennials.

      2. Ok cool! Great to hear! That gives me. Great hope in attempting to grow them again. Maybe even back crossing them to the Zea mays-diploperrennis hybrids.

      3. I am considering building an adjustable LED light system for shifting the light into the red spectrum earlier in order to trick teosinte into tasseling earlier. I have mention it on the OpenAg MIT food computer forum.

      4. Spectrum is an interesting thing but always remember darkness triggers tassel and silk development in teosinte and day length sensitive corn. Light may disrupt that. Teosinte and corn are short day plants and require 12-18 hours of darkness when they are about a foot tall to initiate tassels and silks, but even this does not always work. You’d be better off artificially shading than building a lighting system.

      5. You really think so? Yes i’ve heard of the “trashbag method” of shading them. But my question is has anyone ever tried an artificial lighting spectrum change to see if it does the same thing with teosinte? I don’t think anyone has. Not that I’ve read about anyway. It was just an idea as other non-temperate south american plants can be tricked in this manner so i thought why not teosinte as well.

      6. I don’t think anyone has tested it. It’s pretty well known that teosinte has day length issues. You can give it all the light you want, it requires darkness to trigger enzyme production that translates into tassel and silk formation. A balance is required or you’ll get more tassels than silk, or silks a few weeks after the tassels have died. I’ve spent 12 years researching the day length needs of corn. Day length is a genetic trait that is inherited.

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