Why Boxwood, a long-time favorite, needs a new approach

Boxwood Lovers Gardeners BMP – Best Management Practices – Now is the time to go along with the program. From the time boxing was first introduced in the United States in the middle of the 17th century, boxing requires our attention and care to make it an integral part of the landscape.

It ‘s hard to imagine another plant that’s crawling all year round with a design like Bockwood, which is always green, and has little interest in starving deer – another big plus.

But over the past decade or so, the fungal pathogen Calonectria pseudonaviculata, It causes boxwood disease, damaging this garden and important seedlings. The disease – first reported in the United States in 2011 and has since been reported in at least 30 states and in the District of Columbia – has led to extensive research on how to control it and its potential for resistance in boxwood genetics.

The challenge for landscape and interior architect and designer AJF designer Andrea J. Filippon highlights her feelings for years before the onset of the disease. The traditional art of boxwood care – from normal to one inch of plant life – does not seem to fit her boxing needs.

“This plant has been historically abused,” said Philippine, president of the American Boxwood Society, a charity from kindergarten to homemaker. “We add this plant to its death. Plants drink too much water, only a few leaves are allowed to produce too much fertilizer and photosynthesis.

She is not alone in her review.

“Our cultural decisions are the product of a large number of plants,” says Margherie Dowry, senior fellow at Cornell University Integrated School of Plant Sciences.

Ms. Dautry points out that we are creating a situation that invites trouble. And when air and light are isolated, there is no more hostile fungus than in nearby areas where moisture can occur.

She said the most vulnerable are low fences that describe traditional gardens or standard roses. Rainfall or irrigation are easy targets for fungal infections.

The bottom line is that if we know the value of boxing, we have to change our course. This means selecting the most resilient species for new plants and adapting our care system for new and existing plants to a sustainable approach – adapting those best practices.

These guidelines, ranging from simple pruning to standard mallets and more, should be what Benner Sanders of Sanders Brothers has called the “boxwood gardener new thinking.” The Virginia-based family-owned, more than 100-year-old wholesale retailer has said it has made Bockwood a “signature crop” since the 1950s. Today, that means focusing on reproduction to gain greater resistance to insects and boxwood leaf miners.

The Sanders Brothers has been actively selecting breeds for puppies since 2011, since the nursery center reviewed about 150 species. The gardeners there have begun to make crosses for the more resilient species, and the 5,000 special seedlings now available are in need of testing for disease and pests. The process continues, but so far two species have entered into the New Zealand freedom and the New Zealand freedom.

“We have tried hundreds of species and we have not found a completely resistant one,” Mr Sanders said. “We are getting better plants from growth – from disease and leaf loss.”

Similarly, the United States Department of Agriculture’s Agricultural Research Service and several universities – in Oregon, Texas, Tennessee, Virginia, Maryland, Connecticut, and New York – are also looking for solutions. High risk’s fall 2020 USDA report More than 11 million boxwood plants are sold annually, with an estimated market value of $ 126 million.

A gardener may not notice a problem with the boxwood tree until there are obvious signs, such as rapid decay. But the first tip of the blade is on the leaf. Dark brown dots with dark edges, sometimes surrounded by yellow halo. This is not a skin or brown color caused by winter damage, frost damage, or drought. Leaves damaged by seedlings often fall off, with black and thin lesions appearing on the leaves.

According to the Connecticut Agricultural Experiment, Bokusse sempervirrans are the most common species of boxwood, followed by B. microphylla crosses from the sempervir and then B. microphylla. B. sinica is the least susceptible. However, the report warns: “While we can make general conclusions, there are many differences in species and this should be noted.”

“Cultivar architecture is one of the most important determinants of genital warts,” said Mr. Sanders.

And the way plants operate in different regional conditions varies. None of the resolutions are suitable for every gardener, which brings another need for reproduction for regional issues.

Boxwood is particularly susceptible to disease for long periods of time when the leaves are wet or high humidity, especially when the temperature is between 60 and 77 degrees Fahrenheit. The fungus can temporarily sleep in hot, dry seasons or winter cold. Climate, like Atlanta, can be sick for many months during the year. And more rainfall in 2018, such as in the eastern United States, could lead to epidemics.

Sticky pathogens can spread through tools and other equipment, on clothing or by moving infected plants and plant debris. Once in place, the spores can remain in the soil for years. And relatives of the boxwood family may be the hosts of the fungus Pachisandra and the sweet box (sarcococa).

Mrs. Philippon 1992 Ever since the NJ in the 18th century, when the NJ bought a dairy farm, the deer has never thought of itself as boxing, but with cows.

How did she manage to create the natural, historical landscape, the evergreen landscape that she dreamed of and with her architectural vision? She knows that about thirty and 40 deer will make a short order in the yard.

Answer: Boxwood.

Today, she and her husband, Eric T. Flusher, are known as the J2 de Joos or Boxwood Garden of F2 Environmental Design Live and Garden. Their small boxwood nursery’s property is a popular destination for gardening open days (June 12 this year).

Ms. Filipin has long admired him and highlighted the “boxwood differences”, the number of shapes and even the differences between leaf color and grain.

But as much as you love to create the perfect sphere, mound, or pole, some favorites do not carry the pressure of today. So she stopped using them, especially some dwarf species.

Similarly, the older classics of Saunders Brothers, such as the Buxus sempervirens Suffruticosa, are not for sale.

“You don’t want to make all your boxing choices that are disease-related,” Ms. Dowry said. But it is such an extermination that we must choose based on the possibility that the pathogen may have more or less chance for some time.

There is no cure for disease – even fungicides are only sprayed for prevention – but there is a set of traditional methods that give gardeners the best chance of success.

“Fungal drugs are not a cure. They are defenders, ”said Dowry. Damaged plant parts should be removed and discarded before attempting with pesticides. Always put all the debris in a bag – do not cultivate it – and apply a thin layer of fresh mulch to cover the fallen leaves, which will reduce the incubation.

Leaf miners need to be protected, as is the case with most species growing in the northern hemisphere. (In 2021, other pests, boxwood moths, entered Canada from nursery plants, but very soon to find out how its existence is manifested or affected.)

Our main goals are light and air. Studies show that giving up boxwood can reduce swelling. Again: Low fences are very vulnerable, so it is important to cut a little to encourage air movement under plants. Frequent cleaning of equipment with pesticides also helps prevent transmission.

“Even if we did get rid of that low-fence installation, everyone else would have done better,” said Ms. Dowry, who worked with colleagues at BoxwoodHealth.org to compile more information. “A plant is taller and farther away from the ground, holds more air and becomes better.”

Some methods are simple (and reminiscent of the best practices of tomatoes) Do not over-water; Do not work between plants when the leaf is wet.

And Don’t Forget, a study by Chuwanksu Hong, a professor of plant pathology at Virginia Tech, shows that shellfish are up to 97 percent effective in preventing spores from spreading.

“If a leaf that fell from an infected plant a year ago is replanted, it will not be able to grow again,” said Doutry, who is eagerly awaiting a rapid diagnosis of the disease. The fruit of collaborative efforts to build a better box wood today.


Margaret Rock is the creator of the website and podcast. To the garden pathAnd a book of the same name.

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