Most certain plant ID's?

[Aga Tentakulus]

I'm sure you're right. I wouldn't put my hand in the fire for blackberry here either.
The interesting thing for me is that the plant emerged from experiments with words in cryptology.
Plant from a word and not word from plant.
But there is a certain similarity.

As I said before, lady's mint is a very good candidate. Certainly better than blackberry.

Another thing to do is to look at the uses of a medicinal plant, this might help to get a better picture of the person.