These are a few sites which you may find useful.

UC Davis Degree Day Calculator
It's complicated but will allow you to calculate degree days in your area.

Local soil testing company
Conducts a variety of soil testing services.

Vintage Nurseries
Best selection and combination of clones and rootstock material in the state.

Nova Vine / Tablas Creek
Great for small orders and the sole source for Tablas Creek clones.

We do not recommend buying plants from
OSH, Home Depot, commercial nurseries or other home and garden stores.  They are un-grafted, poorly trained and poor clones that are not appropriate for planting in California or for winemaking in general.

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To contact us:

Phone: 408-242-8598
Fax: 408-273-6717
Email: paul@twogringos.com