This was a fun research project for me today. HelpMeFind has greatly enhanced the search function on the site so that we can do these kinds of comparisons. Of course, we are still in the process of entering information into the data fields, so it will be a while before the feature is fully activated.

I have updated the rose pages for 'Black Lady' and 'Schwarze Madonna' for all of the information I have been able to find today.

There are four primary differences between these roses:
1. 'Black Lady' has a short-to-medium bushy growth habit, while 'Schwaze Madonna' has been reported to be both low growing and tall, but also has a bushy growth habit.
2. 'Black Lady' is reported to be strongly frangrant while 'Schwarze Madonna' has a mild or light fragrance.
3. 'Black Lady' has matte foliage while 'Schwarze Madonna' has glossy foliage.
4. While both roses are listed as "double" (17-25 petals), 'Schwarze Madonna' is generally described as being "very double".

Re: Your reference to 'Black Madonna' --- This name is also used for 'Schwarze Madonna'.

The parentage of both roses was not disclosed by the breeders.

I hope this helps.

Smiles,
Lyn
helpmefind.com