How much did the most expensive bouquet cost
Who brought the least expensive bouquet?
Whose is the bouquet with a disputing meaning
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.