Raine,

I didn't know you could grow cho cho over here in UK??? Did he grow them in a greenhouse or under cover? They are easily grown in Asia (mostly southern I know of) and of course the West Indies. I've never come across the cho cho seed in any of the seed suppliers but I can't imagine how else you save the seed than just letting it dry.

If you want to be on the safe side, why don't you ask this fellow allotmenteer to save 1-2 more seeds for you so you have more than one seeds to experiment with next year. For growing, I think you would treat it same as other fruiting vegetables like cue, tomatoes, aubergine etc.

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