My refractometer arrived today so I went out to the vineyard to try it out. I'd googled Marechal Foch and the concensus seems to be that it's ripe around 23 Brix. Mine are 18-20 so I have a bit longer to wait. I'm in Maryland, north of Baltimore, by way of reference.
I checked the white grapes and they run about 13-16 Brix. Googling the varieties gave me the impression that they're generally harvested at a lower Brix, like in the high teens. Does anyone have a good website or personal experience with the optimal Brix for the following varieties?
Marechal Foch Concord Traminette Niagara Aurore
Thanks for any help you can give.
Paul