Michigan has several tree species that can pose poisoning risks to people, pets, or livestock. Yew, black cherry, chokecherry, Ohio buckeye, and red maple are worth knowing about because certain parts of these plants can contain toxic compounds. However, the risk varies by species, the part of the plant involved, and the animal or person exposed.
Michigan homeowners don’t need to assume that every unfamiliar tree is dangerous. Learning how to identify potentially toxic species and understanding which parts pose a risk can help families make informed decisions about their yards, gardens, and wooded properties. The following examples explain which trees deserve attention and why.
5 Trees in Michigan That May Pose Toxicity Risks
Several trees found in Michigan can cause poisoning in specific circumstances. Yew and Ohio buckeye are notable concerns for pets, while black cherry, chokecherry, and red maple are especially important to understand when livestock may have access to fallen branches, leaves, or other plant material. Not every species presents the same risk to humans and animals.
1. Yew
Yew is an evergreen plant often used in landscaping, foundation plantings, and hedges. Its dark green needles and small, red, fleshy seed coverings can make it look like an ordinary ornamental plant, but yews contain toxic compounds known as taxines.
The needles and seeds are particularly concerning if swallowed. According to the National Capital Poison Center’s explanation of yew poisoning, yew exposure can cause serious illness, and poisoning may become life-threatening.
Keep children and pets from chewing on yew branches or picking at its red seed coverings. Because yew can be trimmed into a shrub-like shape or allowed to grow larger, don’t rely on size alone to identify it.
2. Black Cherry
Black cherry (Prunus serotina) is a native tree found in Michigan’s forests, woodland edges, and other natural areas. It produces clusters of small, dark fruits, but its leaves and other plant parts deserve particular attention around livestock.
Black cherry leaves contain compounds that can release cyanide when damaged. Wilted, frost-damaged, or broken leaves can be especially dangerous to grazing animals, including horses and cattle. Fallen branches after a storm can create a risk if livestock eat the leaves while browsing.
The fruit and foliage shouldn’t be treated as equally toxic in every situation. The principal concern described in Michigan State University Extension’s guidance is the cyanide risk from damaged plant material, particularly for livestock.
Read the university’s resource, Michigan Trees Toxic to Horses, Donkeys and Mules, for more information about black cherry and other hazardous trees.
3. Chokecherry
Chokecherry (Prunus virginiana) is a small tree or large shrub native to Michigan and other parts of North America. It produces clusters of flowers in spring followed by small, dark fruits later in the growing season. Although the fruit may attract wildlife, the plant can pose a serious risk to livestock under certain conditions.
Like black cherry, chokecherry contains compounds that can release cyanide when plant tissues are damaged. Wilted or frost-damaged leaves are a particular concern, especially when animals consume them in large quantities.
Homeowners with horses or other grazing animals should pay attention to chokecherry growing near pastures, fences, and areas where branches may fall. Removing access to suspect plant material is safer than assuming that fallen leaves are harmless because they came from a familiar tree.
4. Ohio Buckeye
Ohio buckeye (Aesculus glabra) is a deciduous tree native to parts of the eastern United States, including Michigan. Its broad leaves usually form clusters of five leaflets, and its fruit capsules contain shiny brown seeds.
The seeds and other plant parts contain compounds that can be toxic to animals. The ASPCA lists Ohio buckeye, also called horse chestnut or fetid buckeye in some references, as toxic to dogs, cats, and horses.
Possible signs of ingestion in animals include vomiting, diarrhea, weakness, and changes in coordination. The exact effects depend on the amount eaten and the animal involved.
Avoid allowing pets to chew on buckeye seeds or fallen plant material. If you have a buckeye in your yard, collecting fallen seeds from areas where pets play can reduce the chance of accidental ingestion.
5. Red Maple
Red maple (Acer rubrum) is a common Michigan tree valued for its fall color. Its bright red foliage can make it a familiar sight in residential yards, parks, and wooded areas. However, red maple leaves can pose a serious poisoning risk to horses when the leaves are wilted or dried.
The toxic compounds in red maple leaves can damage red blood cells in horses, interfering with their ability to carry oxygen. Horses may be exposed when they eat fallen branches, browse on damaged leaves, or consume dried leaves mixed into forage.
This risk is different from the hazards associated with yew or buckeye. Red maple poisoning is especially associated with horses, rather than being a general warning that the tree is dangerous to anyone standing nearby.
Horse owners should keep fallen maple branches and suspect leaves out of pastures and feeding areas. If a horse may have eaten wilted red maple leaves, contact a veterinarian promptly rather than waiting for symptoms to appear.
Which Parts of Poisonous Trees Can Be Harmful?
The dangerous parts of a tree depend on the species. Some trees contain toxins in their seeds, needles, or bark, while others pose a greater risk through damaged or wilted leaves. Knowing the specific hazard helps homeowners avoid unnecessary alarm while taking the right precautions.
Common examples include:
- Yew: Needles and seeds contain toxic compounds that can affect the heart.
- Black cherry and chokecherry: Damaged or wilted leaves can release cyanide, posing a serious risk to livestock.
- Ohio buckeye: Seeds and other plant parts can cause poisoning in animals that eat them.
- Red maple: Wilted or dried leaves can cause severe illness in horses.
A tree’s appearance doesn’t always reveal whether its plant material is toxic. Fallen leaves may look ordinary, and seeds may resemble harmless objects that children or pets want to pick up.
Avoid eating unidentified fruits, seeds, or leaves from trees. If you keep horses or livestock, identify the trees growing near grazing areas and remove access to potentially hazardous plant material.
What Are the Signs of Possible Tree Poisoning in People and Pets?
Possible signs of poisoning depend on the plant, the amount swallowed, and the person or animal exposed. Symptoms may include vomiting, diarrhea, weakness, tremors, breathing difficulties, or changes in coordination. Some toxic exposures can progress rapidly, so waiting for symptoms isn’t a safe way to judge the seriousness of an incident.
Watch for the following warning signs after suspected ingestion:
- Nausea or vomiting
- Abdominal discomfort or diarrhea
- Unusual weakness or lethargy
- Tremors or difficulty walking
- Breathing problems
- Seizures or collapse
These symptoms aren’t unique to tree poisoning, and their absence doesn’t rule it out. A person or animal may need medical attention before obvious signs develop.
How Can You Keep Children and Pets Safe Around Potentially Toxic Trees?
The most practical way to reduce poisoning risks is to identify potentially toxic trees, limit access to dangerous plant material, and teach children not to put unknown seeds, leaves, or berries in their mouths. Pet owners should also prevent animals from chewing on branches or eating fallen leaves.
A few straightforward precautions can make a difference:
- Identify unfamiliar trees. Use a reliable plant identification guide or ask a local extension service to help confirm the species.
- Keep children from tasting plant material. Explain that wild berries, seeds, and leaves aren’t automatically safe to eat.
- Collect fallen seeds and branches. Pay particular attention to areas where children and pets play.
- Check yards after storms. Look for broken branches and wilted leaves, especially if horses or livestock have access to the property.
- Store yard waste securely. Don’t leave potentially toxic clippings where animals can reach them.
When removing branches, avoid assuming that cutting or drying the plant makes it safe. Some toxins remain a concern after plant material has fallen or begun to wilt.
What Should You Do if Someone Eats a Potentially Poisonous Plant?
If a person or animal eats part of a potentially poisonous tree, seek advice from the appropriate medical or veterinary professional immediately, Don’t wait for symptoms to develop, and don’t try home remedies or induce vomiting unless a qualified professional specifically instructs you to do so.
Follow these steps:
- Move away from the plan. Prevent further contact or ingestion.
- Identify the tree if possible. Take a photograph of the leaves, bark, seeds, and overall shape from a safe distance.
- Estimate the exposure. Note which part may have been eaten, approximately how much, and when it happened.
- Contact the right service. Call Poison Control for a person, a veterinarian for an animal, or emergency service if severe symptoms occur.
- Follow professional instructions. Don’t give food, medication, or home treatments unless advised.
If a horse or other livestock animal may have eaten wilted cherry leaves or red maple foliage, contact a veterinarian promptly. These exposures can cause severe poisoning, and early assessment matters.
If the tree cannot be identified, don’t assume the exposure is harmless. Providing a clear photograph and details about the incident can help the appropriate professional assess the risk.
When Should a Potentially Toxic Tree Be Removed?\
A tree shouldn’t be removed solely because its species can be toxic. The decision depends on where the tree grows, whether people or animals can reach the hazardous parts, the likelihood of exposure, and whether the tree has additional structural or health problems.
For example, a yew planted in an inaccessible ornamental bed presents a different exposure situation from one beside a children’s play area. A black cherry near a horse pasture may require more attention than the same species growing well away from livestock.
Before deciding what to do, consider:
- Whether the tree is correctly identified
- Which plant parts create the risk
- Whether children, pets, or livestock can reach those parts
- Whether fallen branches or leaves are likely to accumulate nearby
- Whether the tree also has dead limbs, decay, or structural damage
In some cases, restricting access and collecting fallen plant material may be sufficient. In others, changing the landscaping or removing the tree may be a reasonable option.
Toxicity and structural safety are separate concerns. If a tree also shows signs of significant damage or instability, a tree assessment can help determine whether pruning or removal is appropriate.
Frequently Asked Questions About Poisonous Trees in Michigan
Are poisonous trees common in Michigan?
Several toxic tree species grow in Michigan or are planted as ornamentals. The risk depends on the species, the plant part involved, and whether a person or animal can access it. Finding a potentially toxic tree on a property doesn’t automatically mean the tree must be removed.
Are tree berries in Michigan safe to eat?
No, not all tree berries are safe to eat. Some fruits may be edible while the seeds or other plant parts are toxic, and many unfamiliar species can be difficult to identify. Don’t eat wild berries unless the plant has been positively identified and its fruit is known to be safe.
Which Michigan trees are poisonous to dogs?
Yew and Ohio buckeye are two examples of trees or tree-like plants that can be toxic to dogs. The severity depends on the plant part eaten and the amount ingested. Contact a veterinarian promptly if your dog may have eaten a toxic plant.
Are black cherry trees poisonous to horses?
Black cherry trees can pose a serious poisoning risk to horses, particularly when leaves are damaged or wilted. These leaves can release cyanide, which interferes with the body’s ability to use oxygen. Keep horses away from suspect plant material and consult a veterinarian if ingestion is possible.
Are red maple trees poisonous to horses?
Wilted or dried red maple leaves can be toxic to horses. The compounds in the leaves can damage red blood cells and cause severe illness. Horse owners should prevent access to fallen maple branches and leaves, particularly after storms or pruning.
Can touching a poisonous tree make you sick?
The risk depends on the species and the type of contact. The tree examples in this article are primarily associated with ingestion of toxic plant material rather than simply standing near the tree. Avoid handling unidentified plant material unnecessarily, and wash your hands after yard work.
Are poisonous trees dangerous to birds and squirrels?
Toxicity varies by species and animal. A plant that poses a serious risk to dogs or horses may affect wildlife differently, but that doesn’t mean its seeds or leaves are universally safe. Don’t deliberately feed wildlife unidentified fruits or seeds.
How can I identify a poisonous tree in my yard?
Start by examining the leaves, bark, branching pattern, flowers, and fruit. Compare those features with reliable identification resources from a university extension program or a botanical reference. If identification remains uncertain, don’t rely on a single photograph or one feature to determine whether the tree is safe.
Should I cut down a poisonous tree if I have children or pets?
Not necessarily. First confirm the species and determine how likely children or animals are to come into contact with the toxic parts. Depending on the situation, restricting access and collecting fallen plant material may reduce the risk without removing the tree.
Where can I find reliable information about toxic trees in Michigan?
Michigan State University Extension offers region-specific information about toxic trees, especially those that can harm livestock. The ASPCA maintains a database of plants that are toxic to dogs, cats, and horses, while Poison Control provides guidance for suspected human exposures. These resources can help you make decisions based on the actual species and exposure involved.
