Sometimes when people say they are growing heirloom tomatoes, they are referring to an “open-pollinated (non-hybrid) heirloom cultivar” of tomato. Like other non-hybridized things they sometimes suffer from particular weaknesses or even strengths.
For us, these particular tomato seeds were literally heirloom as they were saved by our cousins back in Missouri from our maternal grandmother’s Cherokee purple tomatoes. I had almost forgotten about these and found them going through seeds this year. Of course I had to see if they would sprout even though they were from 2013.
Every single seed germinated and thrived. We planted 3 and still have 5 that need homes. They are indeterminate and apparently can get quite large, like up to 8-feet tall.