i was told by a few old timers,that cannabis produces a lot of heat. SO thats why I.R. cameras spot big plants so easily. its bright red on the screen, they also told me to research all plant in my area ,and find all the( hot) plants that grow in my area. I did.... I found that mountain ferns ,and banana and herbs like basil and sage, all produce lots of heat. for all u growing out doors , GOODLUCK IF U LIVE IN HAWAII,OTHER THAN BIG ISLAND.