Planting Questions: Need sequoia babys help - all turn yellow at tips outside

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Name: Sequoia fan from Cal
Sep 28, 2017 3:12 AM CST
Hello everyone, 15 months ago I started a small Sequoia Farm here in Switzerland because all such trees here are small (only 100-150 years old) and very few in numbers.
One thing I still can't figure out ist that when I leave them outside in nice, sunny weather all eventually turn yellow, then Brown/Red at the tips of the branches (not at the tips of the needles, but 5mm of every branch). No matter how little or much water - all the same.
When I put them INSIDE for a week or two they all turn green and healthy again. Why do they die if I leave them in the outside sun too Long??!
Also why are they winter-hard only from their third year (according to the seed directions on the packet)? How on earth do they survive in the wild if they are in danger the first 3 years? Someone please help! I want our future generations to enjoy These long after I am gone...
At this time I've No Photos because all are INSIDE again recovering from (sunburn?) Thanks!

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