The Giant White Bird of Paradise (Strelitzia nicolai) is a tropical, humidity loving plant so it won't hurt to increase the humidity. The leaves on your plant may just be doing what they normally do. The ones I've seen growing outdoors seem to all have split, raggedy leaf edges ... maybe it's normal as the plant ages? Hopefully someone who grows this monster plant indoors will pop in with their thoughts and advise.
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~ Playing in the dirt is my therapy ... and I'm in therapy a lot!
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