The pea is the seed of the legume Pisum Satvium, and generally is grown, as Wikipedia describes:
as a cool season vegetable crop. The seeds may be planted as soon as the soil temperature reaches 10 °C (50 °F), with the plants growing best at temperatures of 13 to 18 °C (55 to 64 °F). They do not thrive in the summer heat of warmer temperate and lowland tropical climates but do grow well in cooler high altitude tropical areas. Many cultivars reach maturity about 60 days after planting. Generally, peas are to be grown outdoors during the winter, not in greenhouses. Peas grow best in slightly acidic, well-drained soils.
However, as this AP story indicates, the pea can also grow in a man’s lung . . . I’m not quite sure how a man’s lung compares to the description above, but isn’t that a scary thought? Vegetables can live off of you! We already knew with large predator animals that it is hunt or be hunted, but now we have to worry about un-pasteruized peas?
I can see a B-rated Sy-Fy movie about this Attack of the Killer Peas (incidentally, I loved Attack of the Killer Tomatoes and then the short-lived Saturday morning cartoon). They can hire M. Night Shyamalan to direct it.