The pilot project, created by The Big Lottery Fund (BIG) and Royal Botanic Gardens, Kew targets 12 to 25-year-olds, particularly those from disadvantaged backgrounds, and has 35,000 seed kits to give away before March 10.
There are different wildflower seed mixes for England, Scotland, Wales and Northern Ireland and have been designed to make it easy for people to grow wildflowers and create a haven for wildlife.
Grow Wild is led by Kew and funded by the Big Lottery Fund. Groups such as Greenspace Scotland, Groundwork, the RSPB and Kew's UK Native Seed Hub are also involved.
Kew director of public engagement and learning Angela McFarlane said of the project last year: "Young people have concerns about the environment but feel unable to do anything. Grow Wild will help them make space for wild plants."
To register for a kit, click here.