To grow potatoes properly, the Royal Horticultural Society (RHS) also explains on their website: “Potato plants need ‘earthing up’ as they grow, to protect early shoots from frost damage and ensure the developing potatoes aren’t exposed to light, which turns them green and poisonous.
“It’s a simple process – once the stems are about 23cm (9 inches) tall, draw soil up around them, creating a ridge about 15cm (6 inches) high. As the stems grow, repeat the process several times.
“The final height of the ridge should be 20–30cm (8 inches to one foot).
“Keep the plants well watered in dry weather – particularly once the tubers start to form.
“Maincrop potatoes benefit from a nitrogen-rich fertiliser around the time of the second earthing up.”
When potatoes are ready to harvest will depend on the type of potato being grown.
But most potatoes are available to harvest from May to October.