Wild Yeast Harvesting: Brewing Sourdough Starters from Urban Air

Published on March 18, 2025

by Tara Parker-Pope

There’s nothing quite like the tangy, slightly sour taste of a fresh sourdough bread. And while you may think that the only way to get that delicious flavor is by purchasing a starter from the store or getting some from a friend, think again. Did you know that you can actually harvest wild yeast from the air around you to make your very own sourdough starter? It’s easier than you might think, and in this article, we’ll show you exactly how to do it. Welcome to the world of wild yeast harvesting: brewing sourdough starters from urban air.

What is Wild Yeast?

Before we dive into the process of harvesting wild yeast, let’s first understand what exactly it is. Wild yeast is a type of yeast that is naturally present in the environment, specifically in the air and on plants. It’s different from commercial yeast, which is specifically cultivated and used for baking. Wild yeast is unique and can bring its own distinct flavors to your baking creations.

Why Harvest Wild Yeast for Sourdough Starters?

So why should you bother harvesting wild yeast instead of just buying a starter or getting one from a friend? The answer is simple: flavor. Wild yeast can bring a complex and delicious flavor to your sourdough bread that you won’t find in store-bought starters. Plus, it’s a fun and unique way to connect with your food and the environment around you.

How to Harvest Wild Yeast

Now that you know the benefits of harvesting wild yeast, let’s get into the process. Here’s what you’ll need:

A Jar or Container

First things first, you’ll need a clean jar or container with a lid. This will be where you collect your wild yeast from the air.

Flour and Water

Your starter will need food and moisture to thrive. All you need is some flour and water to create the perfect environment for wild yeast to grow.

A Piece of Cheese Cloth or Paper Towel

This will act as a cover for your jar or container, allowing air to pass through while keeping any unwanted bacteria out.

Step 1: Mix Flour and Water in Your Jar

In your jar or container, mix equal parts flour and water. You don’t need a lot, just enough to cover the bottom of the jar.

Step 2: Place the Cheese Cloth or Paper Towel on Top

Now cover the top of the jar with cheese cloth or a paper towel and secure it with a rubber band or string. This will allow air to pass through but will also keep out any unwanted particles.

Step 3: Let it Sit

Place your jar in a warm, dark area and let it sit for a couple of days. During this time, you’ll see bubbles form and notice a distinctive scent, indicating that wild yeast is present and growing in your starter.

Step 4: Feed Your Starter

After a couple of days, it’s time to feed your starter. Simply add more flour and water to the mixture and mix well. This will help to continue growing and strengthening your wild yeast.

Step 5: Repeat and Use in Recipes

Continue feeding your starter and keep it in a warm, dark place. Over time, you’ll notice that your starter will become stronger and more active. When it’s ready, you can use it in sourdough bread recipes, or even other baked goods like pancakes or waffles.

In Conclusion

Harvesting wild yeast from urban air to brew sourdough starters is a unique and fun way to add flavor to your baking. With just a few simple ingredients and some patience, you can create your own starter that will bring a whole new level of deliciousness to your sourdough creations. Give it a try and enjoy the taste of homemade, wild yeast sourdough bread.