What Are Lees in Wine? A Simple Guide

If you read the back label before you buy, you'll have run into "lees", "sur lie" or "aged on the lees" at some point and wondered whether it mattered. It does, and it's simpler than the wine trade makes it sound.

What are lees?

Lees are what's left behind after fermentation: spent yeast cells, grape solids and other bits that drop out of the wine and settle at the bottom of the tank or bottle. Every wine has them at some stage. What changes from bottle to bottle is how long the winemaker leaves them in.

There are two kinds:

Gross lees. The heavier sediment that sinks quickly. Most winemakers clear these out soon after fermentation finishes.
Fine lees. Smaller particles that take far longer to settle and are too fine to filter out easily. These are the ones worth keeping, and the reason sur lie ageing exists.

What does "sur lie" mean?

Sur lie is just French for "on the lees". It means the wine has been left sitting on those fine lees instead of being racked off them straight away.

As the yeast cells break down, a process called autolysis, they release sugars, amino acids and proteins into the wine. That gives you more body and a rounder, creamier texture, plus better clarity and stability. Some winemakers stir the lees back through the wine to increase the contact, which is called bâtonnage.

It's mainly a white and sparkling wine technique. Champagne, Cava, Muscadet and a lot of Chardonnay are made this way.

What do lees taste like?

Yeast, essentially, but in a good way. The classic markers are bready and toasty notes, the smell of a bakery rather than anything sour.

Beyond that you'll find:

Brioche and biscuit
Hazelnut and almond
Hay and dried straw
Elderflower and other soft floral notes

The texture matters as much as the flavour. A wine aged on the lees feels rounder and fuller in the mouth than the same wine racked off early.

How long do wines spend on the lees?

Anywhere from a few months to several years, depending on the style and how much character the producer wants.

The classic regions have it written into law:

Non-vintage Champagne: a minimum of 12 months on the lees.
Vintage Champagne: at least three years.
Cava Reserva: a minimum of 18 months.
Cava Gran Reserva: a minimum of 30 months.

Plenty of producers go well past the minimum. That's usually where the deep toasty, nutty character comes from.

Two lees-aged wines to try from DrinkWell

Both are vegan, gluten-free and zero sugar, and both show the technique clearly.

Mas Macia Cava Brut Nature Reserva - 83 kcal

The Reserva on the label means a minimum of 18 months on the lees, and you can taste it. Wood smoke, toast and baked apple on the nose, then stone fruit, mineral acidity and a fine bead. Long and savoury. From Penedès, 12% ABV, 0g sugar, Sommelier Wine Awards silver. If you want to understand what lees ageing does without spending a fortune, start here.

Ayala Brut Nature Champagne - 83 kcal

Ayala deliberately extends the autolysis on this one, and it's a zero dosage Champagne, so there's no added sugar to hide behind. What's left is precision: citrus, salinity and a chiselled minerality, mostly Chardonnay with some Pinot Noir and a little Meunier. 12% ABV, 0g sugar. Made for oysters, sashimi and anything from the sea.

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