Monty Don meets two sets of gardeners who are desperate for his help and advice so as to turn their outside spaces into dream gardens. In Worthing, Emma and Josh want to create a family garden for their little Downs Syndrome boy, Noah. Currently the space is totally overgrown, but Monty gets them going by helping them clear the site. Following a trip to RHS Wisley Gardens, they learn about filling the garden with different types of sensory plants. But as the rain sets in, can the pair create a garden to make their son proud? Meanwhile in Hitchin, Monty is faced with a different challenge to create a community garden for the whole street. Aletheia is passionate about creating a neighbourhood veg patch and a trip to Cranbrook Community Garden in London proves that it is possible, but can Aletheia persuade her own local community to join in?