Planting Dates will vary from year to year and around the country. The soil temperature should be at least 6C (43F). A good indication of this is when grass and weeds begin to grow, usually in March/April, but it could be later for north and east areas. Place the tubers rose end up in the bottom of holes or trenches that are 15cm deep. The shoots and leaves of potatoes are frost tender, so be prepared to protect them with cloches or fleece if frost is forecast. Earlies: Plant mid-March to the end of May with tubers spaced at 30cm, in rows 50-60cm apart. Second Earlies and Maincrop: Plant mid-March to the end of April with tubers spaced at 35cm, in rows 75cm apart. More at https://www.gardenorganic.org.uk/factsheets/growing-potatoes