Seyval Blanc is one of the most successfully grown grape varieties grown in the UK today. It is a hybrid variety which in viticultural terms means that it is has a degree of American non-vinifera parentage and was produced in the early 20th century by crossing Seibel 5656 with Seibel 4986. It was introduced in the UK by Major General Sir Guy Salisbury-Jones in the early 1950s and has proved ideally suited to English weather being resistant to low temperatures and to disease.
It is an early budding variety and is particularly vigorous with severe pruning being required in order to avoid overcropping. It is produced in the UK wine as a single varietal wine as well as being blended with varieties such as Müller-Thurgau, Reichensteiner and Madeline Angevine. It produces wine of crisp acidity and with good levels of ripeness in years in which the weather has been kind to growers. In poor unripe years it can produce wines with piercingly high acidity levels that are often offset by the retention of some residual sugar.