The biggest problem with the smaller trees is that they have been raised in sheltered nurseries, so they get out in the sun with no humidity to speak of, and have not been acclimated to it, especially when combined with the hot wind. We set up a bench next to our barn where there are a few bigger trees to the other side, to help get plants "weathered in" - then if they are going to a completely unprotected site, after we plant them we surround them with cedar fence pickets cut in half (so each is 3 feet tall) pounded into the ground in a circle, so they don't get wiped out by the first strong wind or 100 degree day. We still lose some trees, but this seems to have helped quite a bit.
Did you do anything to introduce your 6-week old Cochins to the older girls, or just put them in the coop? I have two older girls and 5 young ones, and right now they are in separate coop-and-run setups inside a 10x10 enclosure. I've let the bigger ones out of their run so they can get to know the little ones, and any day now I will do the reverse, so they still have a layer of wire between them and no one can get hurt. Chickens just instinctively seem inclined to eliminate anything they consider an intruder; I'm guessing it is an evolved response.
Did you do anything to introduce your 6-week old Cochins to the older girls, or just put them in the coop? I have two older girls and 5 young ones, and right now they are in separate coop-and-run setups inside a 10x10 enclosure. I've let the bigger ones out of their run so they can get to know the little ones, and any day now I will do the reverse, so they still have a layer of wire between them and no one can get hurt. Chickens just instinctively seem inclined to eliminate anything they consider an intruder; I'm guessing it is an evolved response.