SS - four seeds per hole? Isn't that overkill, especially if you've already pregerminated them? Or do you mean put one seed at each corner of the 1ft square planting hole?
When I have limited amounts of 'special' seed, I tend to sow them in root trainers, especially pea and bean seeds. I treated myself to a couple of packs of them last year and they were great. I used them on the seeds from the Heritage seed library, as you only get ten of each kind. Recycled tetra pack juice cartons make great pea and bean pots as they'e got good depth for the roots.
And yes, I'd grow the sweetcorns well away from each other. Like a hundred yards or more from any other variety! Start them off in small pots a week before the last frost and don't plant out until all danger of frost is past. Always plant in a grid, not a line.
Ragged Jack is also known as Red Russian kale.
http://permaculture.info/cgi-bin/eden?plant=1157 (yes I know that's cheating but I'm typing one handed at the mo!
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Perpetual spinach/chard is foolproof.
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