Running out of space, help!

[isuhunter]

Here is my prediciment - not enough space. I've already potted 3 into pots and the other 12 are in the garden and I have 6 more to plant. They are all 3' apart. I plan to stake each end and "weave" twine to hold them up. Can I plant them closer than 3'? If not, I'll look at tearing up some more sod.

Here is what I'm growing - BeefSteak, SuperSteak, Porterhouse, Mortgage Lifter, Pink Brandywine, Mr. Stripey, Cherokee purple, Green Zebra, Bushsteak, BigBoy, Big Rainbow, White Beauty, SuperSweet 100, Husky Cherry, Roma, Burpee Supersauce, Jersey Boy, Brandy Boy, Opalka