I have purchased many vines from Double A Vineyards of the very varietals you have mentioned.Two clones of Tempranillo and Viognier and 8 other varietals.
They are wonderful people to work with and their customer service is very good. Their Viticulturalist Luke Haggerty is a very good source of...
Hi
I use Opti-red.
It is a yeast derivative nutrient, not a tannin.
So I use both FT Rouge and Opti-red during red fermentation. Sometimes I will use it late and not at the beginning, especially with a wine like Petite Sirah.