Is this normal?

Is it normal for Sarracenia "stomachs" to start going black after they are filled with bugs? The Pitchers have lasted awhile before starting to do this.
 

steve booth

Seedling
Its where the pitchers have caught too much prey, the dead arthropods above the digestive zone rot and the nutrients burn the pitcher walls causing them to brown, die and eventually to topple.
Cheers
Steve
 
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