The method of earthing up potatoes can be done when they are planted and then repeat the process when the first signs of foliage appear.
Then, you should be able to do this twice more during the growing season at two-week intervals. You can use garden soil or compost to cover the leaves and stems by piling up in a mound formation over them.
When doing this process, ensure the crops are kept well-watered, especially if we’re experiencing long, dry periods. It’s also ideal to add a fertiliser that’s rich in nitrogen at the point of the second earthing up.
Another bonus of doing this is that it helps keep weeds at bay. By keeping the plants covered, it stops potatoes turning green which happens when they’re exposed to the light. If potatoes turn green, they can be poisonous and inedible.