noun, noun or participle which takes 'suru', intransitive verb
thinning buds and branches; pinching off; disbudding
Gardening term for removing excess buds or shoot tips to improve growth, shape, or fruit quality. Often used with する as a suru-verb.
トマトの摘心をすると、実が大きくなる。
If you pinch off the tomato shoots, the fruit will grow larger.
この時期に摘心することが大切
It is important to do thinning at this time of year.