Bring the milk to scalding; remove from the heat. Finely chop the verbena leaves and add them to the hot milk. Cover and let steep for 2 to 4 hours or, preferably, refrigerate overnight.
Sprinkle the gelatin over the water and set aside to soften.
Strain the infused milk; discard the lemon verbena. Place the milk in a heavy saucepan and again heat to