Grero is a red grape variety found in Umbria in its native Italy.

Viticulture: Giampaolo Tabarrini told me Grero is fairly easy to grow as the bunches are not too compact, the only worry being susceptible to peronospora (downy mildew).

Wineries

See: Tabarrini (Montefalco).

Bibliography

Italian Wine Unplugged (Positive Press, 2017), p.254.