according to wikipedia
The Three Sisters are the three main agricultural crops of various indigenous groups : winter squash, maize (corn), and climbing beans (typically tepary beans or common beans). , used these “Three Sisters” as trade goods.
In a technique known as companion planting the three crops are planted close together. Flat-topped mounds of soil are built for each cluster of crops. Each mound is about 30 cm (12 in) high and 50 cm (20 in) wide, and several maize seeds are planted close together in the center of each mound. In parts of the Atlantic Northeast, rotten fish or eels are buried in the mound with the maize seeds, to act as additional fertilizer where the soil is poor.
TIPS FOR GROWING THE THREE SISTERS
- To try them in your garden, in spring, prepare the soil by adding fish scraps or wood ash to increase fertility, if desired.
- Make a mound of soil about a foot high and four feet wide.
- When the danger of frost has passed (see local frost dates), plant the corn in the mound. Sow six kernels of corn an inch deep and about ten inches apart in a circle of about 2 feet in diameter.
- When the corn is about 5 inches tall, plant four bean seeds, evenly spaced, around each stalk. About a week later, plant six squash seeds, evenly spaced, around the perimeter of the mound.