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I have gone ahead and planted mine out because they arrived in tiny plug trays and I couldn't be faffed with potting them on after reading they are actually quite hardy. They've been out for a couple of weeks now and are doing fine.
There's a really great thread on here about growing sweet peas where I have had loads of good advice - search 'growing sweet peas' and I'm sure you will find it
Dont forget to pinch the tops out.