Koltz is a very small producer of hand crafted wines, made to traditional methods, fermented in open vats, basket pressed and matured under finely grained oaks. Koltz try to make wines that are individual and reflect the estate's philosophy that wines should be a pleasure to drink at every stage of their evolution. Vintage at Blewitt Springs is generally two to four weeks later than most of McLaren Vale. The sandy soils over ironstone make distinctive wines. Shiraz is open fermented and basket pressed, portions are treated to an extended maceration for up to fifty days, depending on season and ripeness. The finished wine is matured in a selection of seasoned and new French oak barrels for up to twenty months.