I'm trying out the Three Sisters method of companion planting this year. It's an old Native American technique whereby corn, beans and squash are planted in close proximity. The (pole) beans run up the corn stalks providing extra support for each and the squash vine around low to shade out the weeds. I sowed the corn at the end of April, giving them a bit of a head start, with the goal being about 4" high before the beans and squash went in the ground at the end of May. I didn't create mounds, as is typical, because my soil type does not jive with mounds. I tried it last year with my pumpkins and the water just ran off as if they were coated in Rain-X. Nothing soaked in. It wasn't until a couple weeks later, upon seeing no sprouts that I realized what was going on and flattened out the mounds.
To accomplish the Three Sisters, I planted 4 corn seeds, 6" apart in a diamond. Then 4 beans in each corner. That's one "mound". Alternating with the corn/bean plots are the squash mounds, with roughly 2-3 plants each. I had a 10' x 10' space to work with so ended up with 7 corn/bean mounds and 8 squash mounds.
1 variety of corn:
Golden Bantam
2 varieties of pole beans:
Kentucky Wonder
Purple Podded
10 varieties of squash:
Howden Pumpkin
Long Pie Pumpkin
Black Beauty Zucchini
Gray Zucchini
Rogosa Violina Gioia Butternut
Golden Hubbard
Lemon
Thelma Sanders Sweet Potato
Buen Gusto De Horno
Greek Sweet Red
My seed order from Baker Creek Heirlooms contained a few bonuses. They must figure anyone ordering over $100 worth of seed has got it pretty bad. Two of them were the Lemon and Sweet Potato squash. I couldn't *not* try them, so with only 8 mounds, I had to double up a couple.
I had a little extra space on the shadier end of the bed (left side of photo), so as an afterthought I threw in some old organic potatoes I had sprouting in the basement. I had held on to them just in case I found room somewhere. They are doing quite spectacular.
Cardboard and straw mulch application in between rows until the squash vines can start meandering and taking over weed suppression duty.
Everyone seems to be happy and getting along quite well so far.