My experience is that they always die. Sorry.

I keep trying, though.

That's been my experience, too - they come up just fine, but croak soon thereafter!

I grew these vines from seed I received in the seed exchange here in the lower mailand of B.C. Canada. They grew hug and flowered beautifully ! I even harvested lots of seed from them. The next year it grew like mad and then croaked ..... But it was a different climate, as i had moved 500 K north the next year.
Jewelyn

I've had a lot of success with this vine in Central Ohio. It doesn't get really huge for me, maybe 6-8 ft, and it's never self-sown, but it's been fairly reliable in an west-facing spot with some afternoon sun.

If you are talking about Tropaeolum peregrinum I found them very easy to grow from seed. I had mine in a window box and they bloomed like crazy but never produced any seeds. If I grow them again I'd give them something to climb on instead of letting them hang because they got to looking a bit leggy towards the end of the season.

Same as all the rest, again, mine didn't reseed, so if you have extras....cadaverknee@hotmail.com we can trade something.