Three Sisters Garden: What Is It and How Does It Work?

Below the surface, the root structure of each crop is also a finely tuned machine. Corn roots are shallow and take up the top layer, bean roots travel deeper, and the squash roots take residence in the empty spaces. This interlocking root system helps establish a symbiotic relationships with fungi and bacteria. “The bacteria fix nitrogen into a form that plants can use, and fungi form mycorrhizae that improve water uptake and nitrogen and phosphate acquisition,” says Beronda.

What are the benefits of the Three Sisters garden?

Today, commercial agriculture spits out vast monocultures consisting of either corn, wheat, or soybeans, and while this one-crop method makes planting and harvesting easier, it doesn’t lead to higher productivity. “Growing plants that have complementary characteristics can lead to more sustainable growth,” writes Beronda. Basically, the benefits of this diverse Indigenous agricultural practice are productivity and a resilience gained by reciprocal relationships. Another positive aspect of the Three Sisters is that these three food sources together to make a complete and balanced meal. Corn is full of carbohydrates, beans are loaded with protein and have amino acids that are missing from corn, and squash possesses vitamins and minerals that corn and beans don’t have.

How do you plant the Three Sisters?

Just like all great relationships, timing is everything. Because these crops are warm season plants that detest frost, plan on installing these three crops in the spring when night temperatures are in the 50 degree range. Here’s what to do: Find a full sun spot and mound your soil about 4 inches high to help with drainage and soil warmth. You will be directly planting all three types of seeds together in the same mound but not at the same time. (Directly planting a seed will encourage a stronger root system and the plant won’t have to deal with transplant trauma.) Plant in this order: corn, beans, then squash.

1. Plant 4 corn seeds first, 6 inches apart, so it can grow above the other sisters (make sure you get a tall variety).
2. Next, plant 4 beans 3 inches from the corn, 2 to 3 weeks later (or when the corn is a few inches tall). Good options are pole beans or runner beans (not bush beans).
3. Once the beans send out climbing tendrils (approximately 1 week later), plant 3 squash seeds 4 inches apart at the edge of the mound. Pumpkin, Butternut, winter squash or other vine-growing types work well. The reason you plant the squash last is that you don’t want the large squash leaves shading out your baby corn and beans before they grow up a bit.

Regarding spacing, make sure each plant has ample room to grow and not be crowded which could make them susceptible to pests and diseases. Also important is to plant enough of each crop for proper cross pollination. This is especially crucial for squash plants that need the help of insects to pollinate their flowers and for corn that appreciates a family of fellow corn. The other alternative is to plant all this in several rows, instead of a mound. A 10 x 10 foot square is the minimum size to ensure proper corn pollination.

Any other ‘sisters’ you can plant?

While the traditional sisters are corn, beans, and squash, you can substitute tall sunflowers, watermelons, zucchini, and amaranth, for example. The important thing to remember is incorporating plants that work in harmony together, that complement and help each other to become the best (and tastiest) they can be.

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