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Southern exposure section of pine tree and nearby bushes dying - is this lack of water? #878720

Asked July 25, 2024, 12:14 PM EDT

We continue to trim dead branches primarily from the southern exposure of pine tree which is adjacent to concrete driveway. One of two nearby bushes also not doing well. Drip system should be watering every third day for 30 minutes, but drips are buried so can’t tell for sure. I’ve begun supplementing with hose watering weekly for one hour.

Douglas County Colorado

Expert Response

Hi Jeff,

I'm sorry to hear about your trees!

I doubt that too little water is the issue, particularly for the juniper growing nearest the garage.  With the lawn so close, I'm sure all of these plants have roots into the area and are getting what they need.

In fact for the juniper, you might consider turning off the drippers--they are more prone to problems caused by too much water than too little.  An established juniper will require no supplemental watering whatsoever in most situations.

The pines do look like they are suffering from sun damage, though, which is a result of the exposure, pruning, and proximity to the driveway.  Much of this damage is done in the winter, when temperatures fluctuate widely between day and night.  More water at this time of year won't help; though watering during dry, warm spells through the winter might make a difference.  The site is difficult, though, so it may not be recoverable.

Do you use any herbicides in the lawn or the rock area?

Certain diseases and insects can also cause branch dieback on junipers--have you noticed anything unusual on the branches that you had to remove?  This could be dark spots on the needles, or tiny scale insects on the twigs?

I hope this is helpful.

Cordially,

John

An Ask Extension Expert Replied July 25, 2024, 3:04 PM EDT

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