Jayer opposed extensive use of chemicals in vineyards and advocated plowing to control weeds. Jayer believed that low yields were the foundation of truly great wines. Jayer was noted for his refusal to filter his wines and known to always destemming his grapes in contrast to habits of other growers in Burgundy that even today let stems go through the crusher when vintages does not provide enough tannins. This has the side effect of adding tannins with more green and bitter character. Jayer also invented a new technique called cold soak that is a pre-maceration avoiding spontaneous fermentation at temperature of about 10 oC for 1-4 days. The method aims to extract more fruit, complex aromas, color, less harsh tannins and add more nose to wines.
He is noted for his wines from the premier cru Cros-Parantoux - a very small vineyard (only 1.01 heactares) of Vosne-Romanée at a high altitude above the famous grand cru vineyard Richebourg. This vineyard at the time had low reputation and was considered too much work and not worth bothering with. The soil consisted of very thin layer of clay limestone sitting on a bed of rock. The soil is very poor, it is very rocky and very cold. Jayer understood early that these conditions made up for a very good natural and fresh acidity in wines. In collaboration with Madame Noirot-Camuzet, who owned the vineyard, Jayer took care of her vineyards (beginning after the war in 1945) and for that was offered to keep half of the harvest for himself. As is the custom of Burgundy, Jayer bought piece by piece through the years of this vineyard from the Camuzet family and in 1978 he was convinced that the quality was right and decided to produce his first 100% cros-parantoux wines.