I have been growing the same cherry for over 10 years. I ran out of seeds years back. Luckily a few volunteers popped up. I learned my lesson and I keep seeds every 2 years. These plants are disease resistant compared to beef steak or larger varieties. I just pulled them last week. They were still growing up top but the bottom 3rd was dead from blight disease. No genetic difference has been observed but much larger fruits in some clusters. I have never found a better cherry and tried seeds from the major sellers. I get all the catalogs. I am pretty sure that they were Burpee. They were my go to for a while.