noun, noun or participle which takes 'suru', intransitive verb
earthing up; hilling; covering with soil
Agricultural term for piling soil around the base of plants, such as potatoes or leeks, to protect them or encourage growth. Also used as a suru verb.
ジャガイモの成長を促すために、定期的に土寄せを行う。
To promote potato growth, earthing up is done regularly.
To increase the white part of leeks, you need to earth them up several times.