1st you are over watering. Just water enough to moisten the absorbing
roots in the upper 4" of soil. may evry couple of days at most.

Many tree problems are associated with the following: They are Case
Sensitive.

Troubles in the Rhizosphere
http://www.treedictionary.com/DICT2003/shigo/RHIZO.html

Unhealthy Trees from the Nursery / Improper Planting
http://home.ccil.org/~treeman/sub1.html
and
Look up "Tree Planting" http://www.treedictionary.com

Improper Mulching - http://home.ccil.org/~treeman/sub3.html
and
http://www.treedictionary.com/DICT2003/M/ Look up "Mulch"

Improper Pruning
http://www.treedictionary.com/DICT2003/tree_pruning

Improper Fertilization (See A Touch of Chemistry)
http://www.treedictionary.com/DICT2003/shigo/CHEM.html

Tree Farming and Related Problems
http://www.treedictionary.com/DICT2003/SOUND/

Sincerely,
John A. Keslick, Jr.
Arborist
http://home.ccil.org/~treeman
and www.treedictionary.com
Beware of so-called tree experts who do not understand tree biology.
Storms, fires, floods, earthquakes, and volcanic eruptions keep reminding us
that we are not the boss.

"JackpipE" wrote in message
ups.com...
I planted 24 thujas from Lowes about 3 weekes ago and they are slowly
turning brown. I watered them about once a day once every two days for
the past 3 weeks and now I water them twice a day (early morning and
evening). Not all of them have this problem but at least half (12).
Few of them were planted close to large oak tree but I don't see any
connection between location where it was planted. They get about 3-5
hours of full sun.
Here are pictures:
http://www.existonline.com/temp/IMGP2628_resize.JPG
http://www.existonline.com/temp/IMGP2629_resize.JPG
http://www.existonline.com/temp/IMGP2630_resize.JPG
http://www.existonline.com/temp/IMGP2632_resize.JPG
http://www.existonline.com/temp/IMGP2633_resize.JPG

All help will be much appreciated.

Thanks,
Jack