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How big can milk kefir grains get?

by Emily Pujol January 11, 2019 1 Comment

Very large milk kefir grain in hand

Most of the time when milk kefir grains grow or multiple, they show new growth on old grains (where the grains get bigger) or they split off and make new grains. They usually do a bit of both, but typically they split off into new grains while still fairly small.  This is what most people think of when they see milk kefir grains:

normal milk kefir grains

Even though they may look connected, there's about 4-6 separate grains shown there. Once in a while though, they just keep growing and growing on the same grain and then it ends up being some kind of gigantic grain. This is one of the biggest grains we've experienced.  Over 4 inches in length! Fully connected!

Large milk kefir grains compared to a penny

4 inch milk kefir grain measured by a ruler

milk kefir grain held

Notice that there is one part trying to break off from its mammoth mother. With continued ferments, it will likely spread its wings and break away.

Another unusual growth is when the grains fill with air and become little encapsulated balloons as shown here:

A milk kefir grain that looks like an encapsulated balloon

A milk kefir grain that looks like an encapsulated balloon by itself

They look beautiful and translucent, however they will eventually deflate and look shriveled and not so beautiful. They may also rise high above the surface during the ferment which is not ideal either.

Grains tend to grow based off the environment in which they ferment (the type of milk, room in the jar, temperature, etc). Small grains, thin grains or shriveled grains may be a sign that they are overcrowded or over fermented. If your grains are unusual in any way, send us a picture. We would love to see it.

Emily Pujol
Emily Pujol


Co-founder, designer and author of Nutritional expert and health coach. Mom of 2 wonderful, free-spirited home-schooled boys. She has 15 years of experience with traditional ferments and their tremendous connection to health. She enjoys hiking with her boys, devouring health books and podcasts, raising chickens and attempting to garden.

1 Response


April 15, 2019

Oh how Kefir grains gave me hope after 12 years of getting nowhere!

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