i've been keeping these plants outdoors, and recently i've noticed brown speckles on the two lowest leaves

i dont have any experience so i was hoping someone could tell what might cause this kind of damage
TurnyBright Reviewed by TurnyBright on . what is causing this problem? (picture) i've been keeping these plants outdoors, and recently i've noticed brown speckles on the two lowest leaves i dont have any experience so i was hoping someone could tell what might cause this kind of damage Rating: 5