His mom used to take him out to a local sunflower field and they would talk and goof off and have an awesome day. She said that sunflowers were known for being so bright and happy and how they had the magic to spread joy. Every trip, Stiles would take one flower home with him and his mom would put it in a vase until their next trip.
When his mom got sick, he would bring her a sunflower every visit and they would still have their talks and goof around until one of them fell asleep.
After she passed away, he would bring a sunflower to her and talk. While everyone else brought lilies and roses on her anniversary, there was always one sunflower among the bouquets. And, despite it’s grim location, it still seemed to bring a small ray of sunshine into the sadness of the grave’s visitors.