Since all of the plants have hydro immunity, does that mean we won't be able to use water spells to extinguish any burn debuffs on our plants?  The rules for immunity state that the object with immunity cannot be targeted or affected by any spell of that type.

Example: My Vine Tree was targeted by a Fireball and now has a single burn marker on it.  I consider casting Geyser to remove this pesky burn token, but I realize that I cannot because the Vine Tree has hydro immunity and cannot be targeted by my Geyser spell.

Is this the intended interaction between the spells? Quite simply, it seems odd that I would not be able to "water" my plants.  Thanks in advance!