On their way back, Joseph broke a twig from each forest they went through. Each time he did that, the forest made a loud noise, which startled a little the princesses, but since they couldn’t explain what happened, they decided to go on.
The next day, when Joseph gave the princesses the little bouquets, he slipped the three twigs into Laura’s bouquet. She was so amazed to see those twigs in her bouquet and had no idea how they could have reached there.