Examples from the Web for varietal
Climate change is making this varietal harder to grow, at least with the same result, Veseth tells The Daily Beast.
This producer makes more Vermentino than any other producer, so clearly they know their varietal.
All varietal forms at present are as yet unstabilized (most varieties of 10 years ago have been discarded).Northern Nut Growers Association Report of the Proceedings at the Thirty-Eighth Annual Meeting|Northern Nut Growers Association
The remainder are to be considered as varietal forms of a very trifling departure from the type, or as hybrids.The History of the European Fauna|R. F. Scharff
Cases of this kind are obviously of the nature of varietal, not specific, change.Facts and fancies in modern science|John William Dawson
Naturalists have therefore distinguished the Asiatic from the European form by giving the former what is known as a varietal name.The Butterfly Book|William Jacob Holland
It is very rare in varietal vineyards and not known to nurserymen.The Grapes of New York|U. P. Hedrick
British Dictionary definitions for varietal
Word Origin and History for varietal
1866, a biologists' word (first attested in Darwin), from variety. In reference to wines, meaning "made from a single variety of grape" is first attested 1941, American English. As a noun, in this sense, attested from 1955.