Good Afternoon- I installed 5- 4ft Picea pungens 'Fastigiata' Columnar Colorado Blue Spruce this past spring and four have since died. This is a special tree that is only developed and grown from Bizon Nursery. www.bizonnursey.com . The home owner siad they watered regulary and didn't notice any bugs that may have been attacking the trees. I looked at them today and they where dead as they could be. They where all installed in the same area and one of them seems to be doing just fine. The home owner has had aver 12 other Bizon CO Blues installed all over the property in the past 10 years with no issues. My question to you is with these trees being extreamly expensive the last thing I would want to happen is to remove the old and install the new and this to happen all over again. Is there any chance I would be able to send you a few branches some being bare and some having needles and you could do some research and maybe have some luck at gathering information? I do know that one of the dead trees had a bag worm. Thanks very much in advance for any infomation you can gather for me. If you can send you or someone else the branches please let me know how to go about it. Thanks again! Justin