This is the 3070th most frequent Catalan word.
morta
The Catalan word "morta" means "dead" (feminine form) in English.
Here, 'morta' is an adjective that describes the state of the plant (feminine singular subject).
La planta està morta perquè no l'hem regada.
The plant is dead because we did not water it.
In this context, 'morta' is an adjective agreeing with 'àvia' (the feminine subject), indicating her current state.
La seva àvia va morir fa temps, ja fa molt que és morta.
Her grandmother passed away a long time ago; she has been dead for a while.
Here, 'morta' modifies 'figura' (feminine singular), illustrating its status as deceased.