Leech Seed (move)/Effect/Generation II

⅛ of the target's HP is drained instead. will release a Pokémon from the effects of Leech Seed. Also, Leech Seed no longer interacts with damage and Haze no longer affects Leech Seed. If a Pokémon uses, Leech Seed will still be in effect, even if the switched in Pokémon is a Grass type. The user can no longer plant a seed on a target with a substitute (but setting up a substitute does not release a Pokémon from existing effects of Leech Seed).