indoor grower going outdoors

this is my 1st attempt at guerrilla growing. i have 3 separate sites. 1 has 5 plants(clones) that were over 2 ft tall when i moved them outside in early may. the second site has 12 clones that were planted in late may and the third site has 20 clones moved outside last week. my problem is with the 1st site. the undergrowth has really filled in and is shading the plants too much i think. 3 of the 5 plants are yellowing and dying on there lower to mid sections. they are not stetching but i don't know what else could be causing this other than lack of direct sunlight. as i said before i am a relatively experienced indoor grower but this is my 1st attempt at growing under the sun instead of hps. i can't cut away too much of the undergrowth as i will risk exposing the plants to discovery by anyone who happens to go for a nature walk in the area. the other 2 sites have much better sunlight as they are in huge fields with no trees. i am thinking of just focussing my efforts on those 2 sites and hope for the best with the 1st site. i will take my digicam with me next time i am out there to give a better idea of what's going on. i cant wait till i'm off probation and can start up my indoor grow again. i like indoors much better. i don't have to worry about people accidently stumbling upon my grow or being seen by the police while going to or coming from the site. not to mention how to harvest 37 plants and get them back to my home without detection! i am also not very fond of lugging 10-20 gal of r/o water and ferts through 4ft tall, tick infested grass!!!!!!! i pulled 15 ticks off myself after the last time i was out tending to the girls. i also chose areas full of poison ivy so it would be very unlikely the people would walk there. luckily i don't catch it, i pulled up a shitload of it with my bare hands to make a clearing for the last batch of plants. i'll keep posting my progress on this thread. any thoughts from people with outdoor growing experience would be greatly apprectiated.