More than 1,000 species of mistletoe grow around the world, and every one of them is a parasitic broadleaf evergreen. These plants attach themselves to the branches of other trees and shrubs and grow in loose, twiggy balls via a root-like structure called a haustorium, which absorbs nutrients and moisture from the host plant. Unlike fast-growing plants that crowd out neighbors, mistletoe taps directly into the tree it lives on, so a heavy infestation can slow growth, weaken branches, and eventually kill a tree.
That parasitic habit makes mistletoe an odd candidate for home cultivation. The balls of stems look unsightly rather than ornamental for most of the year, and their growth can seriously disfigure a tree. You should not grow mistletoe unless you need it for a festive holiday harvest, and even then the plant demands constant attention. Keeping the ball in check is the whole game: the sections below cover the biology, the risks to host trees, the removal methods, and the practical steps for cultivating and harvesting this traditional holiday plant.
What Mistletoe Is and How It Spreads
Mistletoe belongs to the sandalwood order, and the familiar European plant is Viscum album, while the American species most often sold at Christmas is Phoradendron leucarpum. All of them share the same architecture: evergreen leaves, small whitish berries, and a branching habit that forms a dense globe in the host canopy. Homeowners who expect to apply the essential care tips they use on other garden plants will be surprised, because mistletoe has no roots in the soil and takes its entire water supply from the tree.
The haustorium and the host connection
When a seed lands on a suitable branch, it germinates and pushes a haustorium into the bark. The structure grows into the host’s water- and nutrient-conducting tissue, and the mistletoe draws what it needs from that living pipeline. Most mistletoe species photosynthesize their own sugars and rely on the host mainly for water and mineral nutrition, which distinguishes them from fully parasitic plants. The connection never goes away on its own, and that is the key fact behind every control method described later.
How birds spread the berries
The plant spreads through its sticky white berries. Birds eat the fruit and either pass the seeds in their droppings or wipe the sticky seeds onto nearby branches while cleaning their beaks. Each seed is coated in a glue-like substance called viscin that holds it to the bark through wind and rain. One infested tree can seed a dozen others in a single winter, which is why mistletoe tends to appear in clusters across a neighborhood rather than as a single isolated ball.
True mistletoe versus dwarf mistletoe
True mistletoes, the kind used in holiday decor, grow in the upper canopy of broadleaf trees and cause a slow decline. Dwarf mistletoes in the genus Arceuthobium are a different problem entirely: they parasitize conifers, stay much smaller, and can deform entire stands of pine and fir. Foresters treat dwarf mistletoe as a serious disease of timber, while the true mistletoe in a backyard oak is mostly a cosmetic and stress issue. Knowing which type you have changes both the treatment and the urgency.
The Damage Mistletoe Does to Host Trees
A single small ball is rarely an emergency. Mistletoe becomes a problem when it multiplies, because each haustorium weakens the branch it attaches to and the weight of the foliage ball adds leverage during storms. Trees under drought stress suffer more, since the parasite keeps drawing water even when the host is short. In severe cases the combined effect can kill the tree.
How infestations weaken branches
The infection point becomes a structural weak spot. Wood at the site is often swollen and brittle, and branches carrying several balls can snap under ice or wind loads. Repeated infections push dieback from the crown downward, leaving a tree with bare tips and a flush of new shoots low on the trunk. A tree that loses large branches year after year also loses value as shade and screening.
Warning signs to look for
- Rounded evergreen clumps in the bare winter canopy of deciduous trees
- Swollen or cracked bark where the ball meets the branch
- Dieback at branch tips, especially in the upper crown
- Several balls on the same branch or scattered through one tree
- Sticky white berries in late fall and winter
When to call an arborist
If the infestation sits high in the canopy, on a large tree, or near power lines, removal is a job for a professional with climbing gear and a bucket truck. Cutting overhead branches is dangerous work, and a licensed arborist can also judge whether the tree is worth saving. For low branches on small trees, the pruning steps in the next section work fine.
| Severity | What you see | Recommended action |
|---|---|---|
| Light | One or two small balls on lower branches | Prune out the infected branches and inspect again each winter |
| Moderate | Several balls spread across the canopy | Remove infected wood and have the tree checked for stress |
| Severe | Balls on most major branches with visible dieback | Consult an arborist; complete removal of the tree may be needed |
How to Control and Remove Mistletoe
Smart strategies for controlling mistletoe begin with a close look at the whole canopy before any cut is made. Decide which branches are worth keeping, then remove the infected wood with clean cuts back to a lateral branch or the trunk. Cutting the ball off at the surface is not enough, because the haustorium stays alive inside the branch and will resprout.
Removal steps that actually work
- Inspect the tree in winter, when deciduous hosts are bare and the evergreen balls are easy to spot.
- Cut infected branches at least 12 inches below the visible ball, back to a lateral branch or the trunk.
- Bag the cut material immediately so berries do not scatter under the tree.
- Repeat the inspection every winter, because trees near a heavy seed source will be reinfected.
- For balls beyond reach, hire an arborist rather than improvising with ladders and polesaws.
Timing matters. Winter pruning is best for two reasons: the structure of the tree is visible without leaves, and the plant is dormant, which reduces the chance that cut stubs bleed sap. Avoid pruning oaks and elms in spring and early summer, when open wounds attract disease-carrying beetles.
Prevention between removals
Because birds replant the seeds, removal is an ongoing job rather than a one-time fix. Keeping the host tree healthy with deep watering during drought reduces the stress that makes infestation worse. Some gardeners also strip the most accessible berries before they ripen, which lowers the seed bank around the tree in the following season. Neighbors with infested trees can keep reseeding your yard, so a community-wide approach works best.
Chemical and barrier options
Herbicide options exist, but they are rarely worth the risk on landscape trees. The most reliable method remains cutting out the infected wood. A few municipalities have ordinances that require removal of mistletoe threatening street trees, so check local rules before treating trees on public land or in a shared easement. When in doubt, an arborist familiar with local regulations is the safest advisor.
Growing Mistletoe on Purpose for a Holiday Harvest
Cultivating mistletoe deliberately is slow but possible. Unlike vegetables, whose yield depends on soil composition and fertility, mistletoe lives entirely in the canopy, so soil quality matters only to the health of the host tree. The host must be a compatible species, and the seeds must land on young, vigorous branches where the bark is thin enough for the haustorium to establish.
Sowing seeds on a host branch
- Collect ripe, sticky berries in late winter from a local source.
- Choose a young branch on a compatible host, ideally at eye level so you can monitor it.
- Squeeze the seeds directly onto the bark and press them flat.
- Tie a small strip of cloth over each seed to hold it in place for a few weeks.
- Mark the spot and wait; germination can take months, and visible growth may not appear for a year or two.
Patience is the whole method. Mistletoe grows slowly, and a harvestable ball can take three to five years to develop. That timeline is why most households simply harvest from wild trees with permission, or buy sprigs at markets, rather than growing their own supply. If you do cultivate it, treat the host tree as the real asset and keep the ball count low.
Harvesting and handling the sprigs
Cut sprigs keep well when you place the cut ends in water right away, and they last for weeks in a cool room. The white berries are mildly toxic to people and pets, so keep fresh-cut bunches out of reach of children and animals, and skip the berries entirely if you have curious pets in the house. Wear gloves while cutting if you are sensitive to plant saps.
Using Mistletoe for Winter Decor
Gardeners who spend the fall growing a winter garden of cold-hardy plants can add mistletoe sprigs to the same seasonal palette, but the sprigs are harvested rather than sown. A few cut branches tuck easily into wreaths, garlands, and table centerpieces, and the evergreen leaves hold their color for weeks.
Cutting, storing, and displaying sprigs
- Cut sprigs in late fall or early winter, before the berries dry out.
- Store them in a bucket of water in a cool garage or cellar for up to two weeks.
- Hang a bunch with ribbon at a doorway, the classic placement.
- Remove the berries before display in homes with children or pets.
For a fuller look, bundle several sprigs together and wire the stems. Refresh the cut ends every few days to keep the greenery from wilting. The berries stay plump longer in cool rooms, so keep displays away from radiators.
Rules for responsible harvesting
Harvest only where you have permission. Mistletoe is a protected plant in some regions, and stripping it from conservation land or park trees can carry fines. When in doubt, buy from a florist who sources it legally. If you harvest from your own trees, follow the pruning rules from the control section so the host stays healthy and the supply lasts for years.
When decorating with plants for holiday gatherings, a single well-placed bunch keeps the tradition alive without turning the yard into a nursery for a parasitic pest. Keep the balls trimmed, keep an eye on the host tree each winter, and mistletoe stays what it should be: a small piece of greenery with a very old story behind it.