Well, whoever told you that about pine trees sucking the THC out of your weed is someone you should probably never listen to again. Growing near one type of plant or another has absolutely no effect at all on the THC content. It's a question of soil conditions. The problem with growing near pine trees is that the soil near pine trees tends to be acidic, and marijuana doesn't grow well in acidic soil. You should probably spend some time reading the
GrowFaq , and browse the forum for threads on what soil types are favorable and unfavorable for growing weed.