The story of pulling up sprouts to help them grow comes from the first part of Gongsun Chou in the Mencius.
Tips
usage
Book 2 of the Mencius opens 公孙丑问曰 'Gongsun Chou asked' and is cited in two parts, 《孟子·公孙丑上》 and 《孟子·公孙丑下》. It is the source of 拔苗助长, 事半功倍, 浩然之气 'the flood-like vital energy' and 恻隐之心 'the heart of compassion'.
history
公孙 is a compound surname. The book opens with him asking whether Mencius, given power in Qi, could match the deeds of 管仲; Mencius is offended by the comparison.