I’ve started early with the spuds this year. Chitting is the process of leaving them in daylight to get the shouts growing. Helps them get started quickly when you then bury them.
They are ready to plant when you have a 20/30mm of shouts. Remove all but the strongest then plant them at the bottom of a trench and just cover with soil. The spuds grow above the seed potatoe so as the shouts grow keep piling earth on top.