Using poisonous potatoes with the compost results in no action. I expected poisonous potatoes to be compostable, since they are organic and can thus decompose.
Can't compost poisonous potatoes
Chorus, poisonous potato and composter
Dead bushes cannot be composted
Red and brown mushroom blocks cannot be used in the compost
Bamboo cannot be composted
Shroomlights cannot be composted