Planting out squash

I'll be planting out my squash plants in the next week or so as the forecast is looking ok. I'd read that 5' sq was enough space for big ones (Queenlsand blue, Ute, Musquee de Provence). Would people agree with that? Also, I'm planning on using nasturtiums and a few small dahlias between individual pumpkin patches to add a bit of ground cover and interest. Would it be wise to add another few inches onto each five foot square to take account of the fact that there will be a few flowers in there too? Thanks in advance.

Im growing Hundredweight this year and have allocated a 5ft x 11ft bed for 4 plants, though the optimum is, as you say, 5sqft per plant for giants. I wouldn't design in extra space for the nasturtiums and Dahlias if only growing a few around as companions as the pumpkin fruits and stems can be moved aroumd a bit as they grow, as can the nasturtiums if theyre a scrambling variety.

In terms of planting depth, yes the deeper the better so try and plant up to the first leaf nodes.

Thanks very much - I'll keep my flowers to the edges and not plant anything too precious:)

Actually, if you sow a vigorous nasturtium they would probably climb through the canopy as they can be quite thuggish too. Worth a go for the sake of a few seeds. Do take a picture, might even try it myself now
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I think I'm going to keep my dahlias out of the battle but will post a pic of the nasturtium/squash fight:)