If you’re researching the boxwood plant hoping for a home remedy, here’s the honest answer first: it’s a poisonous shrub, and its old medicinal uses faded for good reason. Boxwood — Buxus sempervirens, the same clipped evergreen shaped into hedges and topiary — holds toxic alkaloids in every part of the plant. It has a genuine place in the history of folk medicine, and an equally genuine place on lists of poisonous garden plants. This page covers both: what boxwood is, what tradition and research actually say, and where the real risks lie.
What the boxwood plant is
Boxwood is a slow-growing evergreen shrub or small tree in the Buxaceae family, native to southern Europe, northern Africa, and western Asia, and now grown throughout the US as an ornamental hedge and topiary plant (National Capital Poison Center, 2021). The genus Buxus contains roughly 70 species; common box (Buxus sempervirens) is the one people usually mean by “the boxwood plant.” It has small, glossy, oval leaves and modest pale-yellow flowers, and grows from about one to a few meters tall. In traditional medicine, the leaves and root bark were the parts used.
| Boxwood at a glance | |
| Scientific name | Buxus sempervirens L. |
| Common names | Common box, boxwood, box tree |
| Family | Buxaceae |
| Where it grows | Native to southern Europe, N. Africa, and W. Asia; widely planted across the US |
| Parts once used in folk medicine | Leaves and root bark |
| Key compounds | Steroidal alkaloids — buxine (buxene), cyclobuxine, and related |
| Toxicity | All parts toxic; bitter alkaloids concentrated in leaves and seeds |
Is the boxwood plant poisonous?
Yes — all parts are toxic, with the highest concentrations in the leaves and seeds (National Capital Poison Center, 2021). The main toxins are steroidal alkaloids; the bitter compound buxine (also called buxene) is the primary one, alongside related alkaloids such as cyclobuxine.
The risk looks very different for people than for animals, and that distinction matters.
For people, US Poison Control rates boxwood as generally low in toxicity. Poisonings are rare, partly because the leaves are intensely bitter and unpleasant to eat. A large ingestion would most likely bring on gastrointestinal symptoms — abdominal cramping, nausea, vomiting, and diarrhea. Handling the plant can cause mild skin irritation but is otherwise generally safe (National Capital Poison Center, 2021).
For pets and livestock, boxwood is more dangerous. Dogs, cats, and horses can be seriously affected, and animals that graze on the leaves have developed heavy diarrhea, drooling, dehydration, and, in severe cases, seizures and death (National Capital Poison Center, 2021).
Mildly toxic to a curious adult, potentially deadly to a grazing animal — that contrast is the single most important thing to carry away.
Why boxwood was used as medicine — and why that mostly stopped
Long before it edged garden paths, boxwood sat in the folk medicine chest. Decoctions of the leaves were used in European and Mediterranean traditions against fever and malaria, and the plant carried a reputation as a bitter, sweat-inducing, fever-reducing remedy (Althaus et al., Molecules, 2014). When cinchona bark — the South American source of quinine — was scarce in Europe, locally available bitter plants like boxwood were pressed into service against malarial fevers.
That reputation wasn’t invented from nothing. But the tradition faded for a plain reason: the plant is toxic, any effective dose sits uncomfortably close to a harmful one, and safer, more reliable medicines took its place. Boxwood shares that arc with other historically medicinal but genuinely dangerous garden plants — like foxglove and oleander — where the margin between a dose and an overdose is thin enough to make self-treatment a real gamble.
What modern research shows — and what it doesn’t
This is where it’s easy to be misled, so it’s worth being precise. Isolated compounds from boxwood are a legitimate subject of drug discovery.
In laboratory studies, an alkaloid isolated from B. sempervirens leaves — O-tigloylcyclovirobuxeine-B — showed selective activity against Plasmodium falciparum, the parasite behind the most dangerous form of malaria (Althaus et al., Molecules, 2014). A later study isolated 25 alkaloids from the plant, several of which were active in the test tube against malaria and sleeping-sickness parasites (Szabó et al., Antibiotics, 2021).
The distance between those findings and “boxwood treats malaria” is vast:
- They involve purified single compounds, not the plant or a home-brewed tea.
- The results are in vitro — parasites in a dish, not treated patients.
- The aim is a lead structure to develop into a future drug, which is the opposite of a finished remedy.
There is no good human clinical evidence that consuming the boxwood plant safely treats malaria, fever, or any other illness. Malaria especially is a medical emergency that calls for proven antimalarial drugs. A fever after travel to a region where malaria occurs is a reason to seek medical care promptly, not to experiment with a plant.
You may also come across the claim that a boxwood leaf rinse regrows hair. That one is folk tradition without reliable evidence behind it, and given the plant’s toxicity, it isn’t worth the risk.
Safety: side effects, interactions, and who should avoid it
Because boxwood isn’t a recommended remedy, the safety information that helps you most is about avoiding harm, not about dosing.
- Side effects if swallowed: cramping, nausea, vomiting, and diarrhea in people; the more severe neurological and cardiac effects are described mainly in animals (National Capital Poison Center, 2021).
- Skin contact: possible mild irritation — wear gloves when trimming if your skin is sensitive, and wash afterward.
- Medication interactions: boxwood’s alkaloids can act on the heart and nervous system, and no safe human dose is established, so there’s no reliable way to predict how a boxwood preparation might interact with medications. Treat any internal use as unsafe.
- Pregnancy and breastfeeding: avoid entirely. There’s no safety data, and the plant is toxic.
- Children: keep clippings and any plant parts out of reach — children are the most frequent accidental ingesters of garden plants.
- Pets and livestock: this is boxwood’s real danger zone. Keep dogs, cats, horses, and grazing animals away from hedges and trimmings.
This is the same “cure or kill” caution that applies to other toxic ornamentals with folk-medicine reputations, such as wolfsbane. Who should avoid internal use? Everyone. There is no established safe dose of the whole plant for people.
When to get help
Most accidental nibbles by a curious adult or older child won’t cause serious harm — but you don’t have to guess.
- If someone swallows boxwood and develops persistent vomiting or diarrhea, or if a young child or a large amount is involved, contact Poison Control at 1-800-222-1222 or use the online tool at poison.org. Help is free, confidential, and available 24/7.
- Call 911 if a person has trouble breathing, collapses, has a seizure, or develops an irregular heartbeat after swallowing any part of the plant.
- If a pet eats boxwood, call your veterinarian or the ASPCA Animal Poison Control Center.
- For a fever you were tempted to treat yourself — especially after travel to a malaria-endemic area — see a primary care provider or urgent care. Malaria is treatable, but only with real antimalarial medication.
| Health Disclaimer: This article is for general education and information only. It is not medical advice and is not a substitute for diagnosis or treatment from a qualified healthcare professional. Boxwood is a toxic plant and is not recommended for internal use — do not use it to treat any condition. If you are pregnant, nursing, managing a health condition, or taking medication, talk with your doctor or pharmacist before using any herbal or natural product. In a poisoning emergency, call Poison Control at 1-800-222-1222 or 911. |
Frequently Asked Questions
Is the boxwood plant safe to touch?
Generally, yes. Handling boxwood may cause mild skin irritation in sensitive people, so wear gloves when trimming and wash your hands afterward. The real hazard is from eating it, not touching it.
What happens if you eat boxwood leaves?
In people, a large amount most likely causes gastrointestinal upset — cramping, nausea, vomiting, and diarrhea. The leaves are very bitter, which usually limits how much anyone swallows. For pets and livestock it’s more serious. If you’re worried about an ingestion, call Poison Control at 1-800-222-1222.
Is boxwood poisonous to dogs and cats?
Yes, and it’s more dangerous to animals than to people. It can cause vomiting and diarrhea, and in severe cases neurological signs. Keep pets away from hedges and trimmings, and call your vet or the ASPCA Animal Poison Control Center if your pet eats any.
Can boxwood cure or treat malaria?
No. Boxwood was used traditionally against malarial fever, and isolated boxwood compounds show antimalarial activity in laboratory studies — but there’s no evidence the plant safely treats malaria in people. Malaria is a medical emergency that requires proven antimalarial drugs and professional care.
Does boxwood make hair grow?
A boxwood leaf-decoction scalp rinse is an old folk practice, not something reliable evidence supports. Given the plant’s toxicity, it isn’t recommended.
References
- National Capital Poison Center (K. Yee, PharmD). “How safe are boxwood plants?” poison.org. View source
- Althaus JB, Jerz G, Winterhalter P, Kaiser M, Brun R, Schmidt TJ. “Antiprotozoal Activity of Buxus sempervirens and Activity-Guided Isolation of O-tigloylcyclovirobuxeine-B…” Molecules. 2014;19(5):6184–6201 (PMID 24838073). View source
- Szabó LU, Kaiser M, Mäser P, Schmidt TJ. “Antiprotozoal Nor-Triterpene Alkaloids from Buxus sempervirens L.” Antibiotics (Basel). 2021;10(6):696 (PMID 34200688). View source
