Why Is My Sourdough Starter Not Bubbly And Active?

The frustration is real when you’ve spent time each day mixing flour and water, waiting patiently, only for your sourdough starter to look flat and lacklustre. How come everyone else’s starter (or so it seems) rises and is full of bubbles, when yours is grey, solid and possibly even smells a bit odd?

The good news is that you haven’t done anything wrong, so please don’t chuck it all away. Instead, make a few changes to get your starter looking bubbly and active, ready to bake delicious bread with. Read on for five common reasons your sourdough starter isn’t bubbly and active, and how to fix these at home.

1. You’re not feeding your starter often enough

Regularly adding more flour and water to your starter feeds the yeast in the mixture and allows them to produce gas that rises your dough. If your starter is stored at room temperature, you’ll need to do this at least once a day to keep your starter active. If it’s quite warm, you may need to do this even more regularly, as the yeast use up the food available to them more quickly.

If you store your starter in the fridge (I go into more detail about starter storage in my online Introduction to Sourdough Bread Baking course), the yeast activity will slow right down in the cold temperature. You may need to feed your starter more than once before it reaches full activity again.

If you’ve been building a starter and it’s still looking flat, try taking a small portion, say 10 – 15g of your starter, and giving a large feed wtih 30g flour and 60g water (this is for a rye flour starter). Check back on the starter after 8 – 12 hours for any signs of activity.

2. It’s just too cold for your sourdough starter

As mentioned above, the yeast in your starter will slow right down as the temperature drops (I think we may all feel like doing that as autumn draws in!). A colder starter means that the yeast may struggle to get going and it won’t be active enough to rise your dough.

On colder days, try using tepid water (nothing hotter than your hand temperature) in your starter. Keep your starter away from chilly spots. Don’t put your starter on a direct heat source such as a radiator but, for example, under the lights over your hob or in an oven with the oven light (nothing more!) on can be good spots.

Be aware that at temperatures over 37C, your yeast activity will drop as the yeast die off at higher temperatures.

3. The flour isn’t helping

I always recommend making your sourdough starter with dark (wholemeal) rye flour. Any wholemeal flour will include the outside bran from the orginal grain. This is where the yeast that naturally exist on the grain are found. The bran also gives more nutrients to the developing starter and, in rye, the gluten content is lower, making the starter less gloopy and easier to stir. 

If you’ve been using white wheat bread flour, you may find the starter struggles to get bubbly and can often develop pungent unwanted smells, often because other (unwanted) microbes develop more quickly in the mixture. 

Instead, try using wholemeal (dark) rye flour to build your starter. You can sign up to receive my free step-by-step guide to making your own successful rye flour sourdough starter here. 

4. You’re adding too little (or too much) water

Begin your starter as a relatively wet mixture, to help the yeast thrive. If you use wholemeal rye flour, you’ll find that it thickens up as it becomes more active after feeding. 

Check the amount of flour you’re using versus the amount of water. My rye starter is generally 2 parts water to 1 part flour when beginning. 

5. Patience is key

This is the tough one for me! When I’m excited to start baking bread, I want to have the loaf made ASAP! But baking sourdough bread is truly an adventure in slow food. It’s not something that should take up lots of YOUR time, but you do need to give your starter plenty of time to develop and become bubbly.

So be patient. If there’s no sign of activity after 3 – 4 days of building your starter, keep going. Try some of the changes mentioned above if you need to, but only one at a time so you what has (or hasn’t) worked.

The takeaway?

If you’ve got a sluggish, flat starter, the main advice is to keep feeding and perhaps add a little warmth. Making some simple changes to your starter can often make a big difference. Soon, you’ll have a bubbly, active starter and be ready to bake your first sourdough bread with confidence.

And if you’d like my step-by-step guidance through making both your first sourdough starter and then using this to make a loaf, check out my newly updated Introduction to Sourdough Bread Baking online course. Bake along to the videos, follow the detailed course notes plus try out your new baking skills with two additional sourdough bread recipes.

Find out more and join the course by clicking here.