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Old 06-15-2020, 12:25 PM
 
532 posts, read 239,505 times
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I have a hedge of Thuja occidentalis 'Nigra' in North IL. It is 10 years old, distance between trees is 4'.
My hedge is getting more and more transparent now. I realized that last year, this year it is more transparent. Tree years ago you could not see the neighbor's house, now you can.
Is that the natural aging, or condition we can correct?
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Old 06-16-2020, 03:06 PM
 
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What have you been doing? Trimming, fertilizer, watering, etc?
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Old 06-16-2020, 03:17 PM
 
532 posts, read 239,505 times
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Quote:
Originally Posted by charlygal View Post
What have you been doing? Trimming, fertilizer, watering, etc?
I water them during the summer 90F weather.
I also use Tree and Bush Fertilizer from Baer, however, after reading the instruction during the weekend I realize I did not fertilize enough.
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Old 06-16-2020, 04:02 PM
 
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Are you okay with the height? Trimming the top could for the lower part of the tree to produce more. Also, if the bottom is too dense, maybe trim to allow in more air and sun.
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Old 06-20-2020, 06:21 AM
 
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Quote:
Originally Posted by charlygal View Post
Are you okay with the height? Trimming the top could for the lower part of the tree to produce more. Also, if the bottom is too dense, maybe trim to allow in more air and sun.
No, the bottom becomes more and more transparent.
I shall try to trim the top per your advice.
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Old 06-21-2020, 01:45 PM
 
Location: Virginia
5,620 posts, read 2,787,944 times
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Quote:
Originally Posted by Maple47 View Post
No, the bottom becomes more and more transparent.
I shall try to trim the top per your advice.
Before you do anything to your thuja, do you have a local county extension agent? If so (and I'm sure you do), I would strongly recommend that you take some good pictures of the hedge and a portion of a branch into the office if they are taking in-person appointments and have the agent give you a professional diagnosis of the problem. There may be issues causing the condition that we can't diagnose over the Internet. You can always contact your local Master Gardener group as well - they'll be happy to recommend solutions!
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Old 06-27-2020, 06:48 AM
 
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No, they cancelled the office hours, so I cannot bring the samples to the office...
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Old 06-27-2020, 06:56 AM
 
Location: Virginia
5,620 posts, read 2,787,944 times
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Originally Posted by Maple47 View Post
No, they cancelled the office hours, so I cannot bring the samples to the office...
Can you email some really good pictures to the extension agent? I know ours is still working from home even though he's not physically present in the office. He's doing youtube presentations and other public things, and we can contact him with questions as Master Gardeners. It's an avenue to try and pursue.
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Old 06-27-2020, 08:19 AM
 
Location: Huntsville Area
1,367 posts, read 330,068 times
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I've been researching arborvitae's, and have 20 potted to plant right now. They are a very hardy plant--not to be confused with their less hardy Leyland cypress kin.

You might have a dirt problem. I agree about sending pictures to the agricultural agent and talking to them by phone.
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Old 06-27-2020, 02:19 PM
 
532 posts, read 239,505 times
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OK, I shall call. Thank you.
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