I agree with all of the above, plus: Give them a lot of space! If you squeeze them in, they might grow but not produce well, or might ripen late. Give them rich soil -- not fully finished compost or manure is fine for squashes -- and a few feet of space in each direction. The best ones I've grown were at the edge of the garden, so they could sprawl onto the driveway (though they also had plenty of garden space around them, since the root systems also need space, not just the visible sprawl. I got over 50 lbs from two plants (25 kg).
Works at a residential alternative high school in the Himalayas SECMOL.org . "Back home" is Cape Cod, E Coast USA.
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