Boxwood plants are renowned for their versatility in landscaping, offering a range of sizes, shapes, and uses from topiaries to hedges. However, one particular variety has gained notoriety for its unusual and potent aroma, likened to the smell of cat urine. This distinctive scent has sparked curiosity and concern among gardeners and homeowners, leading to a quest for identification and understanding of this unique boxwood. In this article, we will delve into the world of boxwoods, exploring their types, characteristics, and the specific variety known for its pungent smell.
Introduction to Boxwoods
Boxwoods are evergreen shrubs or small trees belonging to the Buxus genus. They are highly valued for their compact growth habit, making them ideal for pruning into various shapes and sizes. Boxwoods are used in a wide array of landscaping applications, from formal gardens and topiaries to borders and hedges. Their dense foliage provides year-round greenery, and with proper care, they can thrive in a variety of conditions. However, the diversity within the Buxus genus also means that not all boxwoods are created equal, with differences in hardiness, growth rate, and, notably, scent.
Types of Boxwoods
There are over 70 species of boxwood, each with its unique characteristics. The most commonly cultivated species include Buxus sempervirens (Common Box or American Boxwood), Buxus microphylla (Littleleaf Boxwood), and Buxus harlandii (Harland Boxwood). Among these, some are prized for their small leaves and slow growth rate, making them perfect for intricate topiaries or compact hedges. Despite their popularity, one type of boxwood stands out for a reason that has nothing to do with its aesthetic appeal or landscaping utility.
The Boxwood with a Notorious Scent
The variety of boxwood that is often described as smelling like cat pee is the Buxus microphylla var. japonica, commonly known as Japanese Boxwood. This particular type of boxwood is known for its small, round leaves and is often used for bonsai or as a low-maintenance hedge. However, it is the emission of a potent, ammonia-like scent from its leaves when they are bruised or cut that has led to its infamous reputation. This smell is not only unpleasant but can also be overwhelming, especially in enclosed spaces or when the plant is pruned.
Understanding the Scent of Japanese Boxwood
The scent of Japanese Boxwood is attributed to the release of trimethylamine, a compound that is also found in the urine of cats and other animals. Trimethylamine is a natural product of the plant’s metabolism but becomes volatile and noticeable when the plant’s cells are damaged, such as during pruning or when leaves are crushed. This chemical is responsible for the strong, pungent smell that many find offensive. It’s worth noting that not all boxwoods produce this scent to the same degree, with Buxus microphylla var. japonica being particularly notorious for its potent aroma.
Cultivation and Care of Japanese Boxwood
Despite its pungent secret, Japanese Boxwood remains a popular choice for many gardeners due to its ease of care and versatility. To minimize the occurrence of the strong smell, gardeners can take a few precautions. Pruning should be done sparingly and with clean, sharp tools to reduce damage to the leaves. Additionally, planting in well-ventilated areas can help dissipate the scent more quickly. Regular watering and fertilization are also crucial for the overall health of the plant, though they do not directly impact the scent.
Alternatives for the Sensitive Gardener
For those who are sensitive to strong smells or prefer to avoid the potential odor of Japanese Boxwood, there are several alternative boxwood varieties that are known for their mild or nonexistent scent. Buxus sempervirens and Buxus microphylla (without the var. japonica specification) are good options, offering similar landscaping benefits without the pungent aroma. These varieties might require slightly different care conditions but can thrive with proper attention, providing beautiful, scent-free greenery for gardens and landscapes.
Conclusion
The world of boxwoods is diverse and rich, offering a range of options for gardeners and landscapers. While the Japanese Boxwood, with its smell likened to cat pee, might not be the best choice for everyone, understanding its unique characteristics can help in making informed decisions about plant selection. For those who are undeterred by its pungent secret, Japanese Boxwood can still be a valuable addition to a garden, offering compact growth and the possibility of creative pruning. As with any plant, proper care and consideration of its needs can help mitigate any potential drawbacks, allowing gardeners to enjoy the many benefits that boxwoods have to offer. Whether you’re a seasoned horticulturist or a beginner looking to enhance your outdoor space, exploring the varieties of boxwood available can lead to the discovery of the perfect plant for your needs, scent and all.
What is the boxwood variety that smells like cat pee?
The boxwood variety that is known to smell like cat pee is the English boxwood (Buxus sempervirens). This variety is one of the most common and widely used boxwoods in landscaping and topiary. It is a popular choice for hedges, borders, and topiary because of its small, round leaves and ability to be shaped and trimmed into various forms. However, some people may find the smell of this variety to be unpleasant, likening it to the smell of cat urine.
The smell of the English boxwood is caused by a chemical compound called trimethylamine, which is produced by the plant’s leaves. This compound is also found in the urine of cats, which is why the smell of the English boxwood is often compared to cat pee. It’s worth noting that not everyone can smell this compound, and the intensity of the smell can vary depending on factors such as the time of year, weather conditions, and the individual’s sense of smell. If you’re considering planting English boxwood in your garden, it’s a good idea to do a smell test before committing to a large number of plants.
Why do some boxwood varieties smell like cat pee while others do not?
The reason why some boxwood varieties smell like cat pee while others do not has to do with the chemical composition of the plant’s leaves. As mentioned earlier, the English boxwood contains a chemical compound called trimethylamine, which is responsible for the smell. Other boxwood varieties, such as the American boxwood (Buxus sempervirens ‘Arborescens’) and the Korean boxwood (Buxus microphylla), do not contain this compound and therefore do not have the same smell. The difference in chemical composition between boxwood varieties is due to genetic differences and can also be influenced by environmental factors such as soil quality and climate.
It’s worth noting that the smell of boxwood can also be affected by factors such as the age of the plant, the time of year, and the amount of moisture in the soil. For example, young boxwood plants may not produce as much trimethylamine as older plants, and the smell may be less intense during periods of drought. Additionally, some boxwood varieties may produce other compounds that can mask or complement the smell of trimethylamine, resulting in a different overall scent. If you’re looking for a boxwood variety that doesn’t smell like cat pee, it’s a good idea to do some research and read reviews from other gardeners to find a variety that suits your needs.
Is the smell of boxwood a problem for gardeners and landscapers?
The smell of boxwood can be a problem for some gardeners and landscapers, particularly those who are sensitive to strong odors or have a large number of boxwood plants in their garden. The smell can be overwhelming and unpleasant, especially during periods of high humidity or when the plants are in bloom. Additionally, the smell can be a problem for people who have boxwood plants near their homes or in enclosed spaces, as the smell can linger and be difficult to get rid of.
However, it’s worth noting that the smell of boxwood is not typically a problem for most gardeners and landscapers. Many people find the smell to be mild and not unpleasant, and some even enjoy the unique scent of boxwood. Additionally, there are many ways to minimize the smell of boxwood, such as planting them in well-ventilated areas, using odor-masking plants, or trimming the plants regularly to reduce the amount of trimethylamine produced. If you’re concerned about the smell of boxwood, it’s a good idea to talk to other gardeners or landscapers who have experience with the plant to get a better sense of what to expect.
Can the smell of boxwood be used for any practical purposes?
The smell of boxwood has been used for practical purposes in the past, particularly in the production of perfumes and fragrances. The trimethylamine compound found in boxwood has been used as a fragrance ingredient in some perfumes and colognes, where it is valued for its unique and intense scent. Additionally, the smell of boxwood has been used in traditional medicine, where it is believed to have antibacterial and anti-inflammatory properties.
However, it’s worth noting that the smell of boxwood is not typically used for practical purposes in modern times. The production of perfumes and fragrances has become more sophisticated, and there are many other fragrance ingredients available that are more pleasant and less intense than trimethylamine. Additionally, the use of boxwood in traditional medicine is not supported by scientific evidence, and there are many other plants and herbs that are more effective and safer to use for medicinal purposes. If you’re interested in using the smell of boxwood for practical purposes, it’s a good idea to do some research and talk to experts in the field to get a better sense of the potential uses and limitations.
How can I minimize the smell of boxwood in my garden?
There are several ways to minimize the smell of boxwood in your garden, particularly if you find the scent to be overwhelming or unpleasant. One way to minimize the smell is to plant boxwood in well-ventilated areas, where the scent can dissipate quickly. You can also try using odor-masking plants, such as lavender or rosemary, which can help to overpower the smell of boxwood. Additionally, trimming the boxwood plants regularly can help to reduce the amount of trimethylamine produced, which can minimize the smell.
Another way to minimize the smell of boxwood is to choose a variety that is known to have a milder scent. For example, the American boxwood and the Korean boxwood are both known to have a less intense scent than the English boxwood. You can also try planting boxwood in containers, which can help to contain the scent and prevent it from spreading to other parts of the garden. If you’re concerned about the smell of boxwood, it’s a good idea to talk to a gardening expert or landscaper who can provide you with more specific advice and guidance on how to minimize the smell in your garden.
Are there any boxwood varieties that are completely odorless?
While there are no boxwood varieties that are completely odorless, there are some varieties that are known to have a very mild scent. For example, the Japanese boxwood (Buxus microphylla ‘Compacta’) is a variety that is known to have a very subtle scent, and is often preferred by gardeners who are sensitive to strong odors. Additionally, some boxwood varieties have been bred to have a more pleasant scent, such as the ‘Winter Gem’ boxwood, which has a sweet and slightly spicy fragrance.
It’s worth noting that even if a boxwood variety is known to be odorless or have a mild scent, it’s still possible for the plant to produce some fragrance, particularly during periods of high humidity or when the plant is in bloom. However, if you’re looking for a boxwood variety that is known to have a mild scent, it’s a good idea to do some research and read reviews from other gardeners to find a variety that suits your needs. You can also try visiting a nursery or garden center to smell the different varieties in person, which can give you a better sense of the scent and help you make a more informed decision.
Can I use boxwood as a natural pest repellent in my garden?
Boxwood has been used as a natural pest repellent in some gardens, particularly to repel pests such as deer and rabbits. The trimethylamine compound found in boxwood is believed to have a repellent effect on some pests, and can be used to deter them from feeding on other plants in the garden. However, it’s worth noting that the effectiveness of boxwood as a pest repellent can vary depending on the type of pest and the specific growing conditions.
To use boxwood as a natural pest repellent, you can try planting it around the perimeter of your garden, or interspersing it with other plants that are susceptible to pest damage. You can also try using boxwood clippings or leaves to repel pests, by placing them near the plants that you want to protect. However, it’s worth noting that boxwood is not a foolproof pest repellent, and may not be effective against all types of pests. If you’re looking for a natural pest repellent, it’s a good idea to do some research and talk to other gardeners to find a method that works best for your specific needs and garden conditions.