The winery is located in the municipality of Piesport (Bernkastel area) in the German wine-growing region of Mosel
. The traditional family has been growing grapes here since 1337. The Johann Haart vineyard was created in the early 1920s by dividing the inheritance of the large Josef Haart vineyard among the seven siblings. Josef Haart's vineyards were marked with termpoles (stakes at each end of the vineyard) coloured yellow at the top. After the division of the inheritance, each child was given an additional colour to mark their inherited vineyards. Haart Johann got yellow-blue, Haart Reinhold
yellow-red and so on. That is why there are still yellow-blue stakes on the boundaries of the plots today. Today, the farm is run by Gerd and Elfriede Haart. They also rent out holiday flats. The vineyards cover six hectares of vines in the single vineyard sites Domherr
, Falkenberg, Goldtröpfchen
and Treppchen (Piesport). They are almost exclusively planted with Riesling (97%), as well as some Pinot Blanc, Müller-Thurgau and Pinot Noir. Important quality criteria in the vineyard are selective harvesting, reduced yields and healthy and highly ripe grapes. The wines are cooled and slowly fermented and then mature in steel tanks. They are vinified dry, off-dry, fruity-sweet and, in years with suitable weather conditions, also noble-sweet.