Willunga 100 has focused on old-vine Grenache in McLaren Vale since its first vintage in 2005. They made their first single-vineyard wine in 2009 and have since helped pioneer a fresher, more lifted style that highlights the sensitivity of Grenache to site in the Blewitt Springs and Clarendon sub-regions. National Wine Show success in 2024, with Willunga 100 winning two of the three gold medals awarded in the Grenache class for the 2022 McLaren Vale Grenache and 2022.

The Grenache grapes are sourced from the estate-owned 'Blind Spot' vineyard in the sub-region of Blewitt Springs in McLaren Vale. The 100% dry-grown, bush vine Grenache comes from three different sections of the vineyard, each with a slightly different aspect and elevation. The average vine age is approximately 50 years old, and the soils of the vineyard are deep Maslin sand over a base of ironstone and clay, resulting in grapes that have great depth of flavour.

The three selected parcels were hand harvested and vinified separately. Fermentation took place in stainless steel, open-top fermenters. Two parcels were fermented with 20% whole bunch (equating to approximately 14% whole bunch across the wine). Gentle basket pressing took place after 10 days on the skins. Following primary fermentation, 60% of the wine was transferred to seasoned French oak puncheons to undergo malolactic fermentation. The wine remained on fine lees for 10 months prior to racking and bottling, unfined.

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