#FreetownTheTreetown is the Sierra Leonean capital’s campaign to plant and grow a million trees by the end of 2022. It prioritises areas at risk of landslide, as well as riverbanks and the low-income areas most in need of regreening. By taking a community ownership approach and using blended sources of finance and digital innovation, Freetown has developed a replicable, sustainable financing model for urban nature-based solutions. Here, Technical Director of the #FreetownTheTreeTown campaign Eric Hubbard and his team share their advice for peers in other cities – especially those that are under-resourced.