Jaen shows at its best in the Dão region, and that's where most of it is grown.
The vines are vigorous, prone to mildew and botrytis infection, and the grapes ripen early, providing low acidity and poor colour. At worst its wines are watery and acidic, at best highly perfumed, reminiscent of blackberry, blueberry and cherry. Despite a slightly rustic character, it can make early-drinking, soft, silky reds that are simple yet seductive.