Absorb Water (from puddles): Click on a puddle and click Absorb Water. Your Plant Sim should walk over, kneel down, and gain some Water until the puddle is gone. So now you can clean and fill your Plant Sim's Water Need at the same time!
Poison Kiss: Found under the Mischief category. Can only be used on/by Teen and older. Does a Blow Kiss animation and then the receiver falls asleep, tranquilized for a bit.
Compliment Leaves: Plant Sims or non-plant-sims can Compliment Leaves of Plant Sims. Found under Friendly.
Discuss Plants with other Plant Sims. Found under Friendly.
Discuss Eco-Friendly Alternatives with other Plant Sims. Found under Friendly.