How can I get the young lady's letter?

Hint 1 of 4:

You'll need to scare her into giving it away.

Hint 2 of 4:

Fulbert might scare some people.  Look for a way to get him close to the
lady.

Hint 3 of 4:

If the florion plant next to her were taller, he might be able to climb it
and scare her into giving up her letter.

Hint 4 of 4:

One of the potions will make the plant taller.