I've heard from multiple sources that long slow fermentations produce the highest quality ciders (see, e.g., http://homepage.ntlworld.com/scrumpy/cider/cider.htm and http://www.lostmeadowvt.com/cider/other.htm). In my limited cider making experience (3 batches), I have found this to be the case.
Cider-makers can take a number of steps to slow down fermentation (minimizing aeration, low fermentation temperatures, low-nutrient juice, keeving, etc). Pitching rate must also factor in, but I've found relatively little information on cider pitching rates. Clearly quality cider can be made via natural fermentation, but assuming you're starting with pasteurized or sulfited juice, how much yeast should you add?
Let's start by looking at wine pitching rates. Since grape juice has a much higher OG than apple juice, we'll use wine pitching rates as reasonable upper bound on cider pitching rates. Standard wine pitching rates are 25-40 g/hL (via Lalvin's website). 25g/hL translates to about 1 gram per gallon.
According to Gillian Grafton (see above link), traditional pitching rates for English ciders are 5-15 times lower than beer pitching rates. The standard ale pitching rate (via George Fix) is 0.75 million cells/mL/˚Plato. Assuming a gravity of 1.050 (fairly middle-of-the-road for unadulterated apple juice) and 90% viability, this translates to 35 billion cells per gallon, or 2 grams of dry yeast per gallon. This figure divided by 5 to 15 equals 0.13 to 0.4 grams of dry yeast per gallon (2.3 - 7 billion cells per gallon).
So I don't have an answer, but I think 0.13 - 1 grams of dry yeast per gallon is a reasonable range. Any thoughts?
Obviously you can make good cider with higher pitching rates, as many of us have, but if you've ever had a really good Normandy cider, you know that we have a lot of room for improvement. Refining our fermentation practices has to be part of that.
Cider-makers can take a number of steps to slow down fermentation (minimizing aeration, low fermentation temperatures, low-nutrient juice, keeving, etc). Pitching rate must also factor in, but I've found relatively little information on cider pitching rates. Clearly quality cider can be made via natural fermentation, but assuming you're starting with pasteurized or sulfited juice, how much yeast should you add?
Let's start by looking at wine pitching rates. Since grape juice has a much higher OG than apple juice, we'll use wine pitching rates as reasonable upper bound on cider pitching rates. Standard wine pitching rates are 25-40 g/hL (via Lalvin's website). 25g/hL translates to about 1 gram per gallon.
According to Gillian Grafton (see above link), traditional pitching rates for English ciders are 5-15 times lower than beer pitching rates. The standard ale pitching rate (via George Fix) is 0.75 million cells/mL/˚Plato. Assuming a gravity of 1.050 (fairly middle-of-the-road for unadulterated apple juice) and 90% viability, this translates to 35 billion cells per gallon, or 2 grams of dry yeast per gallon. This figure divided by 5 to 15 equals 0.13 to 0.4 grams of dry yeast per gallon (2.3 - 7 billion cells per gallon).
So I don't have an answer, but I think 0.13 - 1 grams of dry yeast per gallon is a reasonable range. Any thoughts?
Obviously you can make good cider with higher pitching rates, as many of us have, but if you've ever had a really good Normandy cider, you know that we have a lot of room for improvement. Refining our fermentation practices has to be part of that.