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Welcome to our tree column, “Ask your local arborist.” Each month, arborists from the Davey Tree Expert Company in Menlo Park discuss a tree-related topic from general care and planting tips to how trees can impact your property. If you have a tree-related question or an idea for a topic to discuss, email lifestyle@embarcaderopublishing.com or post in the comments section at the end of this column.
It’s too early to tell if the Bay Area will experience a wetter- or drier-than-average winter. The National Oceanic and Atmospheric Administration’s winter outlook predicts that a slowly developing La Nina will influence the winter months bringing wetter weather to the northern United States and drier weather to the south. The Bay Area, however, could go either way, according to the administration’s outlook, which shows an equal chance of the area experiencing more rain than usual or drier conditions than usual.
Either way, December typically signals the start of our rainy season and cooler temperatures. Preparing your trees for winter is critical for their health and will set the stage for a vibrant spring landscape.
So now that December is here, what should you be doing right now along the Peninsula to ensure your trees stay healthy? Be proactive, especially when it comes to pruning, moisture monitoring and stone fruit care.
Here are some winter tree-care tips:
Remove dead branches
Pruning during the dormant season helps shape your trees and remove any dead or diseased wood that could pose a hazard during winter storms. Focus on removing weak or crossing branches and make clean cuts close to the trunk or main branches.
While pruning is essential, avoid excessive removal of branches. Strive to maintain the tree’s natural shape, as over-pruning can stress the tree and make it susceptible to environmental factors. The goal here is to make sure the tree is comfortable and not fighting itself.
For large pruning jobs, it’s best to consult with a certified arborist to ensure the work is done correctly.
Monitor soil moisture levels
Even though it’s winter, your trees still need water.
Ensure the soil remains adequately moist, especially during dry spells. Overly dry soil can stress trees and make them more vulnerable to disease. Use a soil moisture meter or simply check the soil manually by digging down a few inches to see if it’s dry or moist.
Pay special care to stone fruit trees
Stone fruit trees, such as peaches, plums and cherries, need special attention during the winter. Prune them to remove any diseased or deadwood and to improve air circulation. This reduces the risk of fungal infections that can take hold in the cooler, damp winter months. Also, inspect the trees for signs of pests and disease, and treat any issues promptly.
Apply dormant oil
Dormant oil is a key tool in preventing pests and diseases in your trees and shrubs during the winter. It works by smothering overwintering insects and their eggs, reducing pest populations in the spring. Apply dormant oil to your stone fruit trees and other susceptible plants during a calm day when temperatures are above freezing, and the trees are fully dormant.
George Reno is a local arborist at The Davey Tree Expert Company in Menlo Park, which serves communities on the Peninsula, including Menlo Park, Atherton, Palo Alto and Redwood City. Reno can be reached at 866-923-5658.
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