one light bleaching (White leaves) to close to light to hot
two the plant naturally leaves dies turns yellow all part of life cycle
three you might have been giving to much n last cycles
four you got your feeding right.....!

i aslo grow similar trainwreck/blue also wheelchair/blue its all a matter of the plants life cycle some turn in 5th week some in 8th depends on room and strain, i also run whites that do purple/yellow in last 2weeks, but i trigger all things by environmental changes, but from what i can see they look fine as late in flowering it seems they are right on time to use up that n stored in the plant.
Native¥organicfarmer Reviewed by Native¥organicfarmer on . Yellowing and White Leaves??? Hello. Im doing my 4th grow. All my grows have consisted of same strain and nutes. Im running: 1000 HPS Bio Thrive Bloom and Bio Bud as directed Temps 75 day/night and Hum 45% day/night Ocean Forest/Pro Mix 70/30 cut Im on day 40 of a 60 day flower. Ive grown this strain Blueberry/Trainwreck in the past under exact same conditions. Recenctly in this grow Ive noticed yellowing of the leaves coming directly out of the top buds. Ive never seen this before. I realize larger fan leaves Rating: 5