Multiattack

The treant makes two attacks or makes one attack and uses Animate Plant.

Slam

Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 20 (4d6 + 6) bludgeoning damage.

Rock

Ranged Weapon Attack: +10 to hit, range 60/180 ft., one target. Hit: 15 (2d8 + 6) bludgeoning damage.

Animate Plant

The treant magically animates a Large or larger plant within 60 feet. The plant is immobile but it acts on the treants initiative and can make slam attacks or rock attacks if there are rocks to throw within 10 feet of it. Non-plant creatures treat the ground within 15 feet of the plant as difficult terrain as surrounding roots conspire to trip and grasp moving creatures. The plant remains animated for 1 hour. If the treant uses this action while it has three plants animated in this way the plant that has been animated the longest returns to normal.