Why Boxwood Plants Have a Bad Odor?

Boxwood plants are widely known for their beautiful and dense foliage, making them a popular choice in landscaping. However, what many people don't know is that these plants can emit a bad odor, which is not only unpleasant but also alarming. In this article, we will explore why boxwood plants have a bad odor and what can be done to mitigate it.

The Science Behind the Odor

The bad smell of boxwood plants is caused by a chemical compound called trimethylamine (TMA). TMA is a naturally occurring compound found in many living organisms, including fish, meat, and certain types of plants. When boxwood leaves are crushed or bruised, they release TMA, which gives off a foul odor similar to that of rotting fish or garbage.

It's worth noting that not all boxwood plants produce the same amount of TMA. Some species, such as Buxus microphylla, have a much stronger odor than others. Additionally, environmental factors such as temperature and humidity can also affect the intensity of the odor.

Health Concerns

The bad odor of boxwood plants is not only unpleasant but can also pose health risks. TMA is a volatile organic compound (VOC), which means it can easily evaporate into the air and cause respiratory problems when inhaled. Prolonged exposure to TMA can cause headaches, nausea, dizziness, and even organ damage.

In addition, boxwood plants are toxic if ingested. All parts of the plant contain alkaloids, which can cause vomiting, diarrhea, and even death in extreme cases. Therefore, it's important to keep boxwood plants away from children and pets.

How to Reduce the Odor

If you have boxwood plants in your garden or landscape, there are several ways to reduce the odor:

1. Choose low-odor varieties: As mentioned earlier, some boxwood species have a stronger odor than others. If you're planning to buy boxwood plants, choose low-odor varieties such as Buxus sempervirens 'Suffruticosa' or Buxus sinica var. insularis.
2. Prune regularly: Regular pruning can help keep boxwood plants healthy and reduce the chance of leaves getting crushed or bruised. Make sure to clean your pruning tools with alcohol or bleach before and after use to prevent spreading diseases.
3. Water properly: Boxwood plants need consistent moisture to thrive but overwatering can lead to root rot and mold, which can worsen the odor. Water your boxwood plants deeply once a week and avoid splashing water on the leaves.
4. Fertilize sparingly: Too much fertilizer can stimulate vigorous growth and make boxwood plants more vulnerable to pests and diseases. Use a slow-release fertilizer in spring and fall, following the instructions carefully.
5. Mulch around the plants: Mulching can help retain soil moisture and prevent weeds, which can compete with boxwood plants for nutrients. Choose a mulch that doesn't compact easily, such as shredded hardwood bark or pine needles.
6. Consider alternative plants: If you find the odor of boxwood plants too strong or risky, consider using alternative plants such as yew, holly, or privet. These plants have similar characteristics to boxwood and are less likely to emit a bad odor.

Boxwood plants may look attractive, but their bad odor can be a nuisance and a health hazard. Understanding the science behind the odor, as well as taking proper care of the plants, can help reduce its impact. By choosing low-odor varieties, pruning regularly, watering properly, fertilizing sparingly, mulching around the plants, and considering alternative plants, you can enjoy the beauty of boxwood without the unpleasant smell.

Boxwood plant in landscape

Trimethylamine

low-odor boxwood, boxwood alternatives, boxwood care