Carnivorous plants are often found in acidic and nutrient-poor environments. The main selective pressure for carnivory is

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Carnivorous plants live in environments with low levels of nitrogen and phosphorus, which are essential nutrients for plant growth. As a result, they have evolved mechanisms to capture and digest insects and other small animals to supplement their nutritional requirements. While the other factors mentioned (lack of iron and calcium sources, incomplete ion exchange, and lack of water sources) may also play a role in the evolution of carnivory, the primary selective pressure is the lack of nitrogen and phosphorus.

Carnivorous Plants Are Often Found in Acidic and Nutrient-Poor Environments