Q.Black Lace And Lemon Lace Pollinate?
I like the look and size of both the Black Lace and the Lemon Lace Sambuca, and I was wondering if they would work together as cross-pollinators. I can’t find any specifics on this. The answer is always much more vague. Thank you for any help you can provide.

Certified GKH Gardening Expert
They are different species, so they will have a very hard time crossing. This can be done, but it is usually done under strict conditions to allow the breeders to ensure that cross pollination, is indeed, happening as intended.
The short answer for the home gardener is that it is not very likely. There is no harm in trying, but you will not know until the next generation of seed grows,and shows characteristics of either one or both parents. In order to keep any traits from that generation, there will be a need to back cross a few times to the parent with the traits that you are looking for.
This collection of articles will offer more information on elderberries: https://www.gardeningknowhow.com/category/edible/fruits/elderberry/page/2