You can rebuke and command plants as a cleric can undead.
Prerequisites
Plant Defiance, ability to cast speak with plants.
Benefit
You gain the Channel Divinity ability to rebuke plants. This functions as rebuke undead, including the ability to command plants.
Your effective cleric level is equal to the level of the class that granted you the speak with plants spell.
Due to gaining a new form of channel divinity, you gain one additional use per day.