From the label:

40% Estate vineyard
40% Maple "
20% Norton Ranch

In the 15th year of producing Lytton Springs, they decided that they would drop
Zinfandel from the label - it is a blend of 85% Zin, 8% Petite Sirah, 3%
Carignan, and 2% each Alicante and Grenache.

Blended from 23 small separate fermentations. 14.5% alcohol