The Grubby Gardeners team was led by Thompson & Morgan plant hunter and Ideal World TV presenter Michael Perry.
Perry said: "I was invited to attend Perennial’s 175th anniversary party at The Roof Gardens in January where I really began to understand what a difference the charity makes to people’s lives.
"I owe my love of plants and gardening to my grandparents and wanted to pledge my support for the charity supporting horticulturists young and old with something a bit off the wall. Getting a team together to tackle The Dirty Dozen Races seemed perfect."
So far, the team has raised £5,000. Perennial volunteer support officer Laura Garnett said: "We’re hoping to raise £175,000 this year to mark our anniversary. Michael’s Grubby Gardeners are going to send us on our way.
"Perennial supports anyone working in, or retired from, gardening with many of our clients describing the charity as a ‘lifeline’. The funds raised through this challenge will go a long way to helping us support more horticulturists and their families get through times of hardship, illness, disability or bereavement this year. We’d like to thank them all for taking part."
To donate see www.justgiving.com/grubby-gardeners.