These questions are always hard to understand, let alone explain.

Lets assume that because we as humans use only 15% of our brain capacity, we have abilities or the potential for abilities that we don't know of, or don't understand. Lets also assume that these abilities include telepathy, or the ability to communicate with one's mind alone.

Then, we can assume that as the mind's blind faith in a particular subject (in this case God) is enough to activate some of these abilities without us knowing. It would then be easier to explain how fervent prayer might help (in this case) plants grow.



Or we can look at it another way. We know that the human brain produces and emits tiny electrical currents. Lets assume that (in this case) plant cells are sensitive to electro-magnetic current. Our brain could then emit electro-magnetic current at a certain frequency during prayer, which could be useful to the plant cells, and thus the plants grow better.

Any other theories dudes?