Several years ago I purchased "Johns" and "Adams" on line, they weren't labeled and only one survived. I found a 1" seedling while foraging in Wisconsin and planted that next to what I think is Johns elderberry.
The first couple of years not much growth, then shot up and flowered in LATE OCTOBER! The following year it flowered at the normal time and I got a huge crop from both elders, the fruits were very similar in size of berry and bunch, the new one however flowered a while after the original, this year it started flowering in late June (as my Black Lace in the front garden was finishing flowering) and still has fresh flowers opening near the end of August, that's 2 full months of flowers. Is this normal? If it isn't it might be a good pollinator for other varieties, or genetic material for extending the harvest.