Well they don't take much room up and there's no harm trying - nothing to lose really.

The seedlings will likely vary quite a bit from the mother, though.

Worth a try, and Blue Vein has such a lovely perfume too, so nothing to lose Amsterdam.

If you can manage to hold onto the seeds until next year, sure you can plant them. However, what actually grows from the seeds is another story as Tug mentioned above.

Do the seeds need any treatment apart from being kept in a paper bag? Stratification etc....

I don't think these need cold stratification. However you want to keep the seeds in a cool, dark, dry place. Be sure the seeds aren't exposed to light which can cause pre-mature germination. Store in an opaque envelop or in a shoebox, someplace dark.

Thanks Bathgate. :)