Albert Barnes on Matthew 15:13

Every plant, etc. Religious doctrine is not unaptly compared to a plant. See 1Cor 3:6-8. It is planted in the mind for the purpose of producing fruit in the life, or conduct. Jesus here says that all those doctrines, of which his Father was not the Author, must be rooted up, or corrected. The false doctrines of the Pharisees, therefore, must be attacked; and it was no wonder if they were indignant. It could not be helped. It was his duty to attack them. lie was not surprised that they were enraged. But, notwithstanding their opposition, their doctrines should be destroyed.

Mt 15:10

(i) "Every plant" Jn 15:2,6