The phrase "single variety of" is grammatically correct and can be used in written English.
You can use it to describe a specific type or kind of something. For example: "The farmer grows a single variety of tomatoes in his garden." This means that the farmer only plants one type of tomato, rather than growing multiple types. Another example: "Our store offers a single variety of organic apples." This means that the store only sells one type of organic apple, rather than having a variety of different types. You can also use it in a comparative sense, such as: "This brand offers a single variety of facial cleanser, while their competitor offers multiple varieties." This means that one brand only has one type of facial cleanser, while their competitor has multiple types. Overall, "single variety of" can be used whenever you want to emphasize that there is only one type or kind of something.
Unlike apple and orange growers, banana importers sell only a single variety of their fruit, the Cavendish.
Most of their vodkas are not only vintage (made from a single potato harvest), but also from a single variety of spud.
It would cost Southern Gardens millions of dollars just to perform the safety tests for a single gene in a single variety of orange.
In the 19th century, Ireland depended on a single variety of potato that was planted over large areas of land and was ravaged by disease in one single outbreak.
In 1959, the Dept. of Water Supply, Gas, and Electricity undertook a 65 million dollar modernization program to replace the obsolete poles with a single variety of pole with mercury-vapor lamps, which are brighter and longer-lasting.
Together, they inspect every single variety of ground cover, from lakes of spongy iridescent moss to lavender patches of Quaker-ladies, from tasseled ferns to a pygmy hemlock whose crown has been assiduously trimmed to look like a friar's tonsure.
Another change profoundly affects the final product: Victor now elects just a single variety out of two dozen or so types of maguey when he makes a batch, rather than mixing several as he once did, as most producers once did.
"Only when producers opened their minds to single varieties of grapes grown in particular terrains did they start producing quality wines that got customers excited," he said.
Camellias do well in pots, love shade and give much-needed early spring colour; the rest of the year, they are dull, but the glossy foliage is elegant; I like the single varieties of the autumn-flowering C. sasanqua and the hybrid C. x williamsii, but there's plenty of froth if that's your thing.
Current data are mostly confounded by poor experimental design; in particular, there is a lack of studies using single varieties of foods grown in similar localities under tightly controlled conditions and of assessment methods sensitive enough to detect the impact on human health of any diet that is still nutritionally adequate.
Rarely have I encountered such a range of styles and quality in a group of wines from a single vintage and a single variety, all of them ostensibly made in the same general way.
