Are my thuja green giants underwatered?

[Svalen24]

Hello!

I planted 20 thuja about a month ago (zone 5)

They actually grew about a foot but lately I’m seeing
That they are not as vibrant green and some branches
Turning pale/ yellowing. Also branches are droopy.

I think they are under watered. I had been watering for about 30 seconds with a hose every other day.

I’ve heard it should have been more like 2 minutes
Per tree with a hose, which I did last night.

I plan to keep water long every other day for 2 minutes per tree.

Question is how much longer should I do this? End of NOvember? Have I damaged their establishment process by under watering or will they recover?

Here’s a picture of one.

 

[Svalen24]

Picture of tree

 

[Anniekay]

Every other day is far too often. You want to water deeply just once a week. Your water has to penetrate down past the roots so that the roots will grown down to cooler, wetter soil. Water them without the spray feature at a moderate flow and let the water penetrate, approximately 2 gallons per plant weekly if it doesn't rain.

 

[Verdant]

I agree with Annie, long and deep. Not short and frequent.
My green giants love water and even handle occasional flooding.
I water newly planted trees in the first few years and then only during dry summer weeks. Yours looks like it's in the root zone of other trees which means it has to compete with them for water. A nice blanket of 3"- 4" deep mulch would make them happy too.