Dig the City organiser Alex King says it's about inspiring people to get creative with their gardening.
More top news
Cloudier compared to Wednesday. Rather cool and breezy. Shower risk over Pennines
A six-year-old girl was bitten on the legs by a police dog while officers were chasing a suspect.
A campaign to free two British journalists has gone viral. Phil Pendlebury, from Wigan, is one of those accused of assisting Islamic State.