Look here for the first hint
Take a good look at the bouquet’s. They all have a card.
Look here for the second hint
There’s a website on the flower cards. Visit this website.
Look here for the third hint
You need to use the notes from the family Silverthorn to determine how many flowers of each are in the bouquet.
Look here for the fourth hint
Use the bookpage of the meanings of flowers to see in which bouquet the meanings are contradict.