August 15, 2021

Summer drought stress causes yellow or brown branches in Santa Rosa Redwood trees

Because Santa Rosa, Windsor, Healdsburg and adjacent cities receive no rainfall for the summer months, Redwood trees begin to show signs of drought stress in late July and August. Trees in areas closer to the coast have the benefit of foggy nights that the Redwood trees are able to utiize the water particles captured by the foliage to provide more water to the trees.

Summer drought stress is indicated by yellowing of internal branches. Additional irrigation will help alleviate the problem. The best way to provide supplemental moisture is using a soaker hose placed around the tree trunk and extending out near the drip line. The drip line is measured from the outer foliage of the tree down to the ground. Place the hose in circles around the tree and leave the hose connection at the outer area of the tree. A hose can be hooked up to the female end of the soaker hose when irrigation is needed. Spreading a four inch layer of Arbor Mulch on top of the soaker hose around your trees will help retain the valuable water. TreePro Professional Tree Care offers free mulch in Santa Rosa, Windsor, Sebastopol, Rohnert Park, Petaluma and Healdsburg areas.

Give us a call to get on our “Chip List” at 528-3300 and we may be able to deliver a free load of mulch to your property. Redwood trees will benefit from as much water as you can give them but considering we are in a drought and water bills must be kept in mind you must choose the amount and frequency of supplemental irrigation. Weekly or bi-monthly irrigation will be beneficial.

It’s of upmost importance to provide extra water during periods of high heat. When temperatures approach 100 degrees or greater Redwood trees begin to exhibit drooping of branch tips on the south and west sides where the sun is hottest. These drooping branch tips can result in the loss of foliage at the ends of the branches. To alleviate the problem increase irrigation during hot periods. An hour or two of water from the soaker hose should be adequate to prevent the die-back of branch tips.