What distinguishes single vineyard Zinfandel wines from blends?

Single vineyard Zinfandel makes are revered for their uniqueness, because of their grape varietal specific terroir that they are able to showcase. Using a commonly the same place of origin, winemakers are able to preserve the delicate nuances of the soil, microclimate, and vine age, that result in wines which are complex, deep and with a clear geographical indication. However, hybrid Zinfandel wines may blend grapes from a number of vineyards or regions so as to achieve a desired flavour profile or consistency in terms of vintage to vintage bottlings.
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