Calendula Flower Quantity In Weight Per Plant

I'm growing calendula for a local herbal medicine business. They know how much flowers they need. I'm trying to figure out a flower weight to plant ratio. I have good soil so I can hopefully expect optimal production. Do you have this info or can you point to a place to find this info? As I'm writing this, I'm realizing that I'm not sure if they want it dried or fresh. So any info on dry weight to fresh weight ratio would be great, too.

We don't have the per-plant yield, but there is per-hectare fresh and dry yields in the ProGrowers data on the website:
www.richters.com/progrow.cgi?search=Calendula