You notice it in winter. The oaks drop their leaves, the branches go bare, and there it is: a round ball of green leaves sitting in the crown that does not belong to the tree. That is mistletoe. It is all over North Texas, and most homeowners see it for years before anyone tells them what it is.
Here is the short version. Mistletoe is a parasitic plant that taps into the tree's water and nutrients. A little of it is harmless. A lot of it is not. And there is exactly one right way to get rid of it.
What mistletoe actually is
The plant is American mistletoe. It starts when a bird eats one of the white berries and wipes the sticky seed onto a branch. The seed sprouts, sends a root-like structure into the wood, and starts drinking from the tree. That green ball you see is the top of the plant. The real plant lives inside the branch.
Mistletoe makes some of its own food through photosynthesis, which is why the clumps are green. But it cannot reach the soil, so it takes all of its water and minerals from the tree. That is the part that matters. Every clump is a second mouth the tree has to feed.
Which North Texas trees get it
Oaks take the most abuse: live oaks, red oaks, and post oaks all host it. Pecans, cedar elms, and hackberries are regulars too. It likes older trees with open crowns, which is exactly where birds perch, and it spreads from branch to branch and tree to tree through those same birds. One infested tree in the neighborhood becomes the seed source for the block.
If you are planting new trees, this is one more reason to favor species that host less of it, and to keep crowns thinned so birds do not have a hundred perches. Our native Texas trees guide covers the keepers.
How much damage it really does
Honesty first: a few clumps on a healthy tree do not matter much. The tree grows around them. Plenty of oaks carry a little mistletoe for decades and do fine. If someone tells you every clump is an emergency, that is a sales pitch.
A heavy infestation is a different story. Dozens of clumps across the crown steal enough water and nutrients to slow growth, thin out the leaves, and starve individual branches until they die back. On an old tree, or one already stressed by drought or construction, a bad infestation can push it over the edge. The tipping point is when the crown starts looking thin everywhere and the clumps outnumber the tree's own foliage in spots.
Spotting it: fall and winter are easy
Mistletoe is evergreen, so it shows itself best when the tree is bare. October through February, scan the crowns of your oaks and pecans for round green clusters that look nothing like the tree's branches. In winter you will also see clusters of white berries on female plants.
Do not confuse it with ball moss. Ball moss is a gray-green tufted plant that sits on branches but is not a parasite. It does not tap into the tree and usually needs no treatment. Real mistletoe is bright green, grows as a distinct round clump, and sends up jointed stems with paired leaves.
If you are unsure what you are looking at, our tree diagnosis guide walks through sorting symptoms step by step.
The only way to get rid of it
Cut the branch a foot or two below the point where the mistletoe is attached. Not at the clump. Below it. The parasite runs invisibly inside the branch, so removing just the visible green leaves guarantees it comes back. A full branch removal takes the whole plant with it.
Do it in the dormant season: December through February. The tree handles the cuts best then, the clumps are easiest to find in a bare crown, and on oaks you are safely inside the low-risk window for oak wilt. Cut during that window and the pruning work doubles as your winter crown cleanup. Our oak trimming timing guide has the details on why that window matters.
What does not work: snapping the clump off, pruning flush with the visible leaves, and spraying. There is no spray that kills the plant inside the branch without hurting the tree. Save the money.
The hard call is when the mistletoe is on a main limb or the trunk itself, or when so many branches are infested that fixing it would mean removing a third of the crown. Cutting off that much of the tree in one visit does more harm than the mistletoe. That is a judgment call, and it is the point where a second set of experienced eyes earns its keep.
When to call a pro
Call when the infestation is heavy across the whole crown, when the clumps are on big limbs or the trunk, when the tree is close to the house or power lines, or when you cannot tell whether it is mistletoe or something else. This is pruning work that follows the same rules as any professional trimming job: right cuts, right season, right amount.
And if the tree is already thin, dropping big limbs, or leaning with exposed roots, the mistletoe may be a symptom of a bigger problem, not the problem itself. Run it through our free tree risk check before spending money on mistletoe work.
Common Questions
Is mistletoe actually killing my tree?
A couple of clumps on a healthy tree is a cosmetic problem, not an emergency. The tree shrugs it off. But a heavy infestation, dozens of clumps stealing water and nutrients year-round, slows growth, thins the crown, and can kill branches. Older or already stressed trees feel it the most. When in doubt, have someone look at the whole crown, not just the green balls.
Can I just pull the mistletoe off the branch?
Pulling it off does not work. The visible green clump is only the top of the plant. It has sunk a root-like structure deep into the branch, and it grows right back from inside the wood, usually within a year or two. The fix is cutting the branch a foot or two below where the mistletoe is attached, so the part of the branch holding the parasite is gone.
When is the best time to remove mistletoe?
December through February, the same window as the rest of your winter pruning. The tree is dormant, cuts recover cleanly, and the evergreen mistletoe clumps stand out in a bare canopy, so nothing gets missed. On oaks, that timing also sits safely inside the low-risk window for oak wilt. See our month-by-month North Texas pruning calendar for the full schedule.
Is mistletoe poisonous to dogs?
The white berries can upset a dog's stomach if eaten, so pick up fallen berries if your dog works the yard. This is general information, not veterinary advice. If your dog ate a handful of berries and is vomiting or lethargic, call your vet. Removing the clumps also removes the berry source.