Sorry to hear about your struggling Hinoki Cypress.

Please supply a bit of history of the trees and their management, including the following:
- When were the trees planted?
- What size were they at planting time? (Either the height or the container size.)
- When did the affected Hinoki begin to show browning? (i.e.: Approximate date.)
- Does the affected Hinoki receive the same number of hours of sunlight daily as the others? If not, how do they differ?
- Please describe anything else you think may be important.

Then, too, please describe the details of the drip system, its placement and use, including the following:

• How often were the Hiknoki watered during the dry months?
• Describe the layout of the drip system for each Hinoki; include (1) the number of drippers, (2) the distance from the trunk; and (3) the output of each dripper (e.g.: gallons per hour).
• How often was the system run?
• How long was the drip system run each time?
• How deep does the moisture penetrate into the soil? (Do you check with a trowel, etc.?)

Is it possible to send an image with all of the Hinoki Cypress in a row? If yes, please do.

(I realize the above asks for a lot of info. You may want to copy and paste the questions, then insert your responses where appropriate.)

I look forward to receiving your responses to the above questions and an additional image or two.