Those round green clumps appearing in bare oak branches this time of year are mistletoe, and they are more than a holiday decoration.
Oak mistletoe is a native parasitic plant common on Oregon white oaks throughout Yamhill County. It pulls water and nutrients from the host branch. A few clumps rarely cause serious harm, but heavy infestations can weaken limbs and cause dieback. The clumps are easiest to spot once the oaks drop their leaves in late fall and winter.
Pruning out infected branches well below the clump is the most effective control. Pulling off the green growth leaves the attachment in the wood, and it regrows. On heritage oaks, the goal is careful, selective cuts that protect long-term structure.
Our white oaks are part of what makes the Willamette Valley special, and stewardship means keeping them healthy for the next generation. A certified arborist can help decide which infected limbs to remove and which can safely stay.
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Photo of an Oregon white oak with visible green mistletoe clumps in its bare winter canopy, ideally against a Willamette Valley landscape. Authentic job photos are strongly preferred over stock images. No individual staff should be named or identified.
Canva text suggestion: "Mistletoe Is a Parasite on Your Oaks" or "Protect the Valley's Heritage White Oaks"