If no one here knows, you could contact someone at Well Sweep Herb Farm (http://www.wellsweep.com/). They propagate, grow and sell 85 different kinds of lavenders, so they would definitely know!

If you're ever in NJ, it's an astonishing place to visit. I buy plants there every year.

a2zmom, I checked out the Well Sweep Herb Farm catalogue and was amazed at the number of varieties they sell. For someone wanting a special lavender plant, this would be the place to contact.

janni_dk, please let us all know what you find out about the darkest possible variety.

Molie, it's not just lavenders, of course. Well Sweep sells close to 2000 different perennials, the vast majority they propagate themselves. It's a family owned and run business; the third generation now works there - I spent some time talking to their grandson who just graduated with a degree in plant biology.

Truly a plant lover's dream nursery.

a2zmom, thanks for the tip! They sure have a lot of different lavenders. I will contact them to see if they have any suggestions. Unfortunately, I'm not able to visit their nursery - I live in Europe.

I'll let you know what I find out.