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Pick potatoes according to their growth period. Potatoes are classified according to the length of time they take to mature, which can be influenced by weather.
Early seed potatoes mature in 60-110 days. Planted towards the end of March, they are typically ready for lifting from late June or early July. A few varieties of new potatoes include Pentland Javelin, Arran Pilot, and Dunluce.
Maincrop seed potatoes mature in 125–140 days and if planted in late April can be harvested by mid-August, and this can continue through to October. These varieties are higher yielding and usually have larger tubers, which can be used fresh or stored for winter use. King Edward, Kerrs Pink, and Harmony are all good examples of this variety.