Earlier this month, the former Love Island presenter was found dead in her home aged 40 after having taken her own life.
Oliver Allen, 9, has since started leaving flowers with handwritten notes attached on people’s doorsteps in his home town of Rochford.
The notes read: “In a world where we could be anything, be kind”, which is a phrase taken from one of Flack’s Instagram posts that has been shared across the internet since her death.
Mr Allen came up with the idea himself after hearing about Flack’s death on the news.
“He handed out about ten bunches of daffodils and hand wrote the messages himself,” said Mr Allen’s grandmother, Dawn Avery.
Avery went on to explain the impact the flowers have had on people so far: “One lady was in tears and another lady received them and passed them onto someone else in her own act of kindness.”
One of Mr Allen’s neighbours who received the daffodils, Sarah Rogers, explained she found the flowers deeply moving.
“Whoever left these outside my house, thank you and god bless,” she said.
“We should all follow this person’s example and do just one random act of kindness for someone, no matter how big or small.”
Ms Avery said that she was “unbelievably proud” of her grandson for his charitable initiative.
“For a nine-year-old to do that is so thoughtful. He looks after small children at school and helps me with my shopping. He has a mature head on young shoulders.”
The 49-year-old added that more young people should do kind acts like her grandson.
“We want that generation to make people feel special and it doesn’t have to cost a lot,” she said.
“Many youngsters are desperate and don’t know where to turn, but just one small kind act changes someone’s day completely.”