I do mine one per sf and trellis them (actually I tie them up to a long stake). They say bush, but they actually vine...just not as much as the vining type.

Granny

Here is a link that might be useful: Annie's Kitchen Garden

I did 2 per SF and trellised them. It was not too crowded, though they all ran together. No biggie if you plant all of the same variety.

I did mine 2/sf, too. They were very productive.

thanks folks. Now I just have to finish my plan, first year doing this and it's trial by fire.

Leeds, i am going to try out a bush cucumber this year. How did it work out for you? Would love an update!