Potatoes will grow very quickly under warm and moist conditions. When they are 10cm tall, the leafy shoots can be mounded around with soil to their full height, a process known as 'earthing up'. Earthing up potatoes will increase the length of underground stems that will bear potatoes. This mounding can be repeated once or twice more at 2 - 3 week intervals to ensure the best crop, with the added benefit of smothering any competing weeds.

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Growing potatoes in a bag? Monty explains how to earth them up:

Find out how to earth up potatoes, below.

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