FusionDex

Though at first glance they appear healthy, Venusect carry an aggressive fungus that parasitises their flowers. The fungus leeches the nutrients that would otherwise go to the Pokémon, forcing them to eat more than usual to make up the shortfall.

Venusect are known to infest the roots of large trees en masse and drain nutrients. Venusect's flower is said to take on vivid colors if it gets plenty of nutrition and sunlight.