they have heat-seekin shit like bagz said that detectz high power lightz, theyve made alot ov bustz usin that. there iz also shit that detectz plant material, even if yer under the treez. id grow in an area thatz already got alotta other plantz around it. an if u r thinkin bout plantin near a tree, big mistake like sum1 already said, treez will take the water yer plant needz an take away frum space fer yer plant rootz ta grow nice an big.
PeAcE