nostr:npub1sg87ny6jfx2ynn725ltts26s3rk4pt9sz4lmzd2uk7w56cdg3nzslp9xmy When there's about 20–30cm of growth above the soil after the last frost, you will need to ‘earth them up’. This is when the soil is drawn up around the potato stems. This stops potato tubers from being pushed to the surface and turning green in the light, making them poisonous. The soil should be drawn up to leave 10cm of leaves exposed to the light and this should be done on a regular basis.