Ok so i have (i think) located a good looking location for Henbane. I located this by cross refferencing known records with google earth
Also call me odd but the nearest train station is in a small town about 2 mile's away, this town has "ford" at the end of it's name.
here is the good bit the only other location that i have found through research is also situated about 2 mile's outside a town with "ford" at the end of its name - these are two completely different towns.
Added to that both of these locations require hiking up hill to around 100m above sea level.
Well maybe it's now't but if this place does have henbane then what can i say - just a coincidence
