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UC Master Gardeners, SLO County, a resource for gardeners
by Jessica Majerus
on July 4, 2018 at 9:01 PM
We live in Rocklin, CA. In the backyard there are 4 redwood trees. One of them has had trouble every summer (this is our 3rd summer here.) The top of the tree looks great, but from about 10 feet up down to the lowest branches on the West side the needles are drying up and falling off, in the past it has looked much worse, but I am concerned that it is continuing to happen. Each summer it happens all around the tree, but is always concentrated on the west side. Our neighbors have the same trees and have no had any of the trouble we have had. We have a drip system for watering: 2GPH with 4 drip heads for 2 hours 3x per day. All of the other trees are tied into this system and are doing great. We do get very hot weather here which is why we water them so much. Our soil is very rocky and does not drain well. Any advise would be much appreciated.
Reply by Maria Murrietta
on August 3, 2018 at 11:22 AM
Hi Jessica, thanks for the question. I want to direct you to the Master Gardener program in your county. They would be your best resource for region specific advice.  
You can find them on their website -  
Or you can reach their help line at 530-889-7388.  
Best of luck!
by Lisa
on August 10, 2023 at 1:21 PM
We have many healthy mature redwoods in our yard in Pasadena . My question to you is regarding a red fluid that is released from the trees occasionally. It’s bright red droplets that rain down a few times a year. I love my redwoods , do you understand the purpose of the red drops ? They do leave almost permanent stains on my new flagstone patio . If you can tell me when the sap is likely to f as lol it would be much appreciated. ! What triggers the release ? Ehich seasons? (Seems like Jan snd April I’ve seen it )  
Thanks so much !  
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