Running a clean malolactic fermentation

Most home winemaking problems are process problems, not fruit problems. This guide covers co-inoculation vs sequential in the order you will actually encounter it on the day.

Start with setup. Lay out every tool, chemical and vessel you will need before the fruit arrives, and sanitize in one pass rather than mid-process. A crush day that stops to look for a hydrometer is a crush day that ends after dark.

Write your numbers down before you act on them. Brix, pH, TA and temperature take five minutes and give you a baseline you can compare against every day of the ferment. Without a baseline you are guessing, and guesses compound.

Work in small, reversible steps. Bench trials on 100 mL samples cost you nothing and tell you exactly what a proposed addition will do to 60 gallons. Any adjustment you cannot undo deserves a trial first.

Sanitation is the cheapest insurance in the cellar. Every surface that touches must or wine gets treated, including your hands, the outside of the hose and the rim of the vessel. Spoilage organisms are opportunists, not invaders.

Finally, plan for the boring middle. Wine spends far more time being topped and monitored than it spends being made. Put a recurring reminder on your calendar for monthly topping and free-SO2 checks, and your wine will be better than most cellars twice its size.

Questions about your specific lot? The Bay Wine Brokers team works with home winemakers every harvest — call the Livermore office and we will talk through your setup before your fruit is picked.