My roots coming out of my solo cups are always white, but the outside ones in the black 1 gallon plastic pots are brown from the sun. I think I'm going to order some more 1 gallon tan Geopots...
Just regurgitating stuff I've read here shed. I read thicker white roots are not what we want, its the finer darker or brownish roots were looking for. Maybe that was something specific to docs kit but am thinking it was in general. I think we sometimes worry about little things like this more than we need to because we all strive to grow the best plants possible.....