1/2 gram of seed per packet; fresh seed
If you're a fan of garden perennials that gently naturalize from season to season, this lovely violet-blue species is worth considering!
This strain of common columbine has been growing at my childhood home - in our California garden - for near 40 years, and reproduces true to type with each subsequent generation. It was only introduced once, and has always been a welcome volunteer. I have shared it with friends, and it now resides in my home garden, as well. As such, it certainly fits the definition of "heirloom."
See more information at the MoBot website on its history and cultivation (far right image at page bottom is best representation of my strain):