Cardiospermum halicacabum

I've grown it, just because I loved the seeds! I tried two years on the trot - managed to save seeds and they did grow but weren't vigorous enough for me. I also started quite early in the season to give them a good season. Just got a bit "lost" in my garden. It is reasonably pretty, but not one for me to bother growing again.

I "think" I put the seeds in one of our swaps once? Black with a white heart on?