Sarricoid

Sarricoids were an artificial form of flowering plant life developed by Professor Sarric. It was a fast-growing plant, ready for harvest hours after sowing, and high in nutritional value. They could also infect humans with their spores sprayed from their flower heads, slowly turning them into plant-like creatures under Sarric's control. Sarricoid meal was sold by Vegpro as part of Sarric's plans to conquer Earth, but the Fourth Doctor learned that they dissolved when exposed to water and had them destroyed. (TVC: Death Flower)