Glass Gem Corn: The Crown Jewel of Heirloom Seed Varieties
When you consider corn, what comes to mind? A common yellow vegetable? A healthy snack? Or a crop that is grown for livestock feed and fuel? How about a beautiful piece of art? That's what your impression may be the first time you see glass gem corn, a surprising variety which appears to be a cob full of gemstones of every color. This is no trick of Photoshop, but the most beautiful and surprising corn variety in the world!
Glass gem is non-GMO heirloom rainbow corn variety that actually comes in many colors. It is best used for cornmeal, as opposed to slathering with butter at the dinner table. It is also a marginally decent popping corn. It is a long season variety, requiring 110 days to reach maturity. The height of the stalks is roughly 6 feet tall.
The Amazing History of Glass Gem Corn
Prior to 2011, glass gem corn was a variety that was undiscovered to modern agriculture, and it may have remained lost if not for a fortuitous twist of fate. A seedsman named Greg Schoen received corn seeds from his "corn teacher" Carl Barnes, who had spent years studying and working with corn varieties. A part-Cherokee man is in his mid-80s from Oklahoma, Carl studied corn varieties extensively and reintroduced many ancient and traditional varieties that had been lost to Native Tribes.
Though Greg and his friend Jose Lucero get the credit for the first modern, large-scale cultivation of the variety, it initially remained part of Greg's private seed collection that he shared periodically with others with the intention of keeping the variety alive. It may not have been introduced widely to the world had Greg not decided to move in 2010. In order to store and protect his precious seed collection, Greg entrusted several different samples of corn seed with Seeds Trust, a 25-year-old, family-owned heirloom and open-pollinated seed company, including the glass gem corn seeds.
In 2011, Bill McDormann, president of Seeds Trust, grew some of the corn that Greg had entrusted to them with amazing results. Photos of the beautiful corn were posted on the internet, and they spread like wildfire. Unbeknownst to Bill, who did not foresee how gorgeous the crop would be and had not grown a large enough supply for sale, a public clamoring for the seeds was about to ensue.
Currently, there are few places to purchase glass gem seeds. The Seeds Trust has a waiting list and currently sells only 50 seeds to each customer as seeds become available. (Though Greg recommends planting at least 300 seeds at a time to maintain the large diversity of colors in your crop's gene pool.)
A few private individuals are just now beginning to offer seeds for sale, however. As individuals begin to grow this variety and it becomes more common, hopefully, the seeds will become more widely available to the public.
Note: You can learn more about glass gem corn and its history at Mother Earth News.
What Gives Glass Gem Corn Its Rainbow Colors?
How do so many vibrant and diverse colors appear on a single ear of corn? The answer lies in an odd phenomenon of genetic inheritance that does not follow Mendel’s rules. Each kernel is actually a different corn plant (or the seed of one) with a unique mix of genes inherited from its parents. Diversity is increased further via transposons, or “jumping genes,” which are strands of DNA that move from place to place in the genome. When they land in a gene for pigment, the color of that cell is altered, producing kernels of a particular color that may be specked or streaked with a second color. The result is a brilliant display of agricultural biodiversity and the beauty of nature.
How to Grow Corn
Though corn takes up a large amount of space in the garden, nothing beats biting into a freshly-picked ear of sweet corn or grinding your own meal for cornbread and tortillas. Whether you choose to grow sweet corn, grinding corn, or ornamental corn, following these guidelines will help to ensure a bountiful harvest.
Where to Plant Your Seeds
- Plant in full sun in richly composted soil. Corn is a heavy feeder, requiring copious amounts of nitrogen. Companion plant the area with nitrogen-fixing beans, clover, or hairy vetch.
- Plant corn in blocks of at least three rows to promote good pollination and kernel formation. Though corn is pollinated by wind, provide protection from strong winds that may damage the stalks.
- To avoid cross-pollination, keep different corn cultivars 400 or more yards apart. This is especially important for supersweet varieties. For most home gardeners, this means that only one variety of corn should be tasseling at any given time.
How to Plant the Seeds
- When planning how much corn to plant, a general guideline is 10–15 plants per person who will be eating the corn. To extend your harvest, plant early, mid-season, and late types at the same time, or successively plant early varieties every few weeks.
- Choose a short season variety if your warm growing season is fewer than 100 days. Corn does not transplant well. But if you start a long season variety indoors, you can transplant it carefully to avoid disturbing the roots.
- Plant the seeds directly in the ground when all danger of frost has passed and the soil warms up to 60 degrees Fahrenheit, which is necessary for seed germination. If the weather cools, spread black plastic on the planting area to help warm the soil, removing it as soon as the seedlings begin to appear.
- Plant seeds 1" deep, three seeds per hole. Plantings should be no closer than 7" and no farther than 15" apart. Seeds will germinate in approximately 10 days. Thin seedlings to one plant per 15" by cutting unwanted seedlings off at soil level.
How to Care for Your Plants
- Water corn on a regular schedule using a soaker hose or drip irrigation that waters at the soil surface. Do not spray plants from above, or pollen may be washed away from the flowering tassels. Drought stress during pollination will result in ears with sparse kernels, so keep an eye on your watering schedule to ensure that the plants are getting enough water during the hot, summer months.
- Keep the bed free from weeds by mulching heavily around young stalks to prevent weed germination.
- When the stalks are 6 inches tall, side-dress by digging a trench along each row, near the roots, and adding blood meal or another nitrogen source to the trench. Repeat this process when the stalks are about a foot high. It is not necessary to remove side shoots or suckers. Leave them alone to avoid damaging roots or stalks.
How to Harvest Your Corn
- When corn silks appear, wait three weeks and then start checking ears for peak ripeness. Carefully peel back part of the husk and pierce a kernel with your thumbnail. If the kernel spurts with a milky liquid, the ears are at prime ripeness.
- Immediately harvest the ears and rush them to the table, or blanch in boiling water for one minute and store them in the freezer. Ears on the same stalk may ripen a few days apart, so test each ear before you pick it!
- Leave ornamental corn, grinding corn, and popcorn on the stalks to dry until you are ready to remove the stalks from the garden at first frost. If the weather is particularly wet, remove the stalks and allow the kernels to completely dry out in a cool, dry area.
This article is accurate and true to the best of the author’s knowledge. Content is for informational or entertainment purposes only and does not substitute for personal counsel or professional advice in business, financial, legal, or technical matters.
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