How to Save Tomato Seeds from Your Garden

Here's the best way to save tomato seeds from your garden so you can plant them next year.

Learn how to save tomato seeds from your own garden in this post

I love a flavorful, red, ripe tomato fresh from the garden. In fact, tomatoes are the reason I began gardening in the first place.

It's a sad fact that most tomatoes you'll buy at the market, especially in the winter time, are mealy and tasteless. Garden tomatoes are far superior.

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This year I've discovered un-red tomatoes. A few years ago I tried yellow pear tomatoes and loved them, but I'd always thought that black tomatoes were downright ugly and kind of disgusting-looking, and how can you tell if green-when-ripe tomatoes are ripe?

While I still haven't tried a black tomato, this year I grew snow white, black cherry and sun sugar cherry tomatoes and the larger Cherokee purple variety.

Red husky, black cherry and snow white cherry tomatoes

By the way, those "snow white" tomatoes aren't white, they are yellow. Just wanted to clear that up, because I was a bit disappointed in the color. They're delicious though, so I won't let that stop me from growing them.

Due to an unfortunate chain of events including a very late freeze, I lost all the tomato plants I'd grown from seed this year as well as the transplants I'd bought and the cuttings I'd kept alive over the winter.

It was too late to start more from seed so I had to buy whatever plants I could find at the local stores, and the pickin's were mighty slim, let me tell you.

So I did what any tomato-loving woman would do: I bought more little transplants at a flea market while we were on vacation in May, and I discovered some new-to-me varieties that I want to grow again.

Cherry Cola cherry tomatoes

I haven't seen seeds for sale for some of these varieties though, so I'm saving them from my own garden plants. Which is always a good idea anyway.

Did you know that if you save seeds and replant them every year, after a few years those seeds have adapted to your own garden climate and soil? They are the perfect plants for your garden.

How to guarantee that your seeds are "pure" (not cross-pollinated)

Saving seeds from hybrid plants is a game of chance though; you'll need to save them from heirloom varieties to get fruit that's true to the parent plants. Hybrids are crosses between two varieties, whether done on purpose or by accident (cross-pollinated by bees or other insects, for example).

Tomatoes are self-pollinated; in other words, they don't require insects for pollination. Instead, the pollen is moved by wind or other movement, so it's pretty easy to isolate a few fruits so that you can save "pure" seeds.

On the other hand, insects CAN cross-pollinate tomato flowers. To guarantee pure seeds, you can cover a stem of flowers with drawstring bags made of organza or tulle, with brown paper bags, or even enclose an entire plant in a screened enclosure (although that's rather impractical for large tomato plants).

Cover the flowers before they open, and make sure that the covering is insect-proof.

Now the secret is to shake the flower stem hard every day so the flowers will be pollinated. When fruit forms you can remove the coverings, but be sure to mark the stem in some way so you'll remember which fruits to save!

Or try this when you plant your garden in spring: separate tomato varieties with a tall crop in between. Planting squash as your barrier crop is another good practice; pollinators will most likely go from a tomato blossom to a squash flower instead of to a different tomato variety.

A bowl full of ripe tomatoes for seed-saving

Save these tomato seeds too!

Cross-pollination actually doesn't happen very often in tomatoes since they are self-pollinating plants. So if you didn't isolate your tomato blossoms a few weeks ago but you still want to save seeds, there's still hope.

You might want to save seeds from the first ripe tomato in your garden, or from the largest, the most-colorful, or the best-tasting. Well, you should always save seed from the best-tasting tomato, because next year's best-tasting tomatoes come from the seeds of this year's best-tasting tomato.

How to gather tomato seeds

It's a good idea to save seeds from a couple of tomatoes of the same variety instead of from just one fruit. Genetic diversity is a good thing.

Let the tomato ripen completely, either on the plant or on your counter, then cut it into quarters and scoop out the tomato seeds and pulp with a spoon. (I've found that the serrated ends of grapefruit spoons are handy for so many things like this, such as removing the pulp and seeds from squash and melons we're going to eat.)

How to ferment tomato seeds so you can plant them again next spring

Let the seeds ferment

Put the seeds and pulp into a jar, using a separate jar for each variety of seed you're saving. Be sure to identify the seed variety in some way: a taped-on slip of paper, or by standing each jar on a paper towel with the variety name written on it for instance.

Add enough water to completely cover the seeds. Cover the jar with something that can breathe, such as a paper towel held on with a rubber band. I cut a piece of paper toweling to fit on top of my canning jars.

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Set the jars in a warm place and let the seeds ferment until there is moldy pulp on top of the water. This might take a week or so.

When the mold develops, add some more water to the jar so you can pour the moldy scum off the top without pouring out the seeds with it. The seeds and remaining water should be poured into a fine wire mesh strainer to catch the seeds.

Sun Sugar cherry tomatoes, tiny but tasty!

How to store your saved tomato seeds

Spread the seeds on a plate or on a paper towel with the variety name written on it, and let the seeds dry for several days. Then scrape them off and into an envelope or baggie.

Actually, I've found that it's nearly impossible to scrape seeds off of a paper towel, so lately I've been using a dinner plate. I can chip the dried seeds off the plate with my fingernail.

Then label the seed container with the variety name and date, and store. I like to keep mine in the door of the refrigerator, even though hubby complains a bit that the entire top shelf is full of seeds instead of ketchup and other stuff.

Pretty easy, isn't it? I know it sounds like a lot of work but it really isn't; it takes time but it isn't time that you have to do something in, it's just "waiting time."

Did you know that it's possible to keep your tomato plants alive over the winter? I like to use both methods - saving seeds and "cloning" my plants.

If you've never saved tomato seeds from your garden tomatoes before, give it a try this year.

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Related Posts:
What to do with the green tomatoes in your garden when the first frost is predicted
How to over-winter your tomato plants
Canning tomatoes, no matter what kind you're growing

By saving seeds from your garden and planting them again, after several years those seeds have adapted to your own climate and soil. They are the perfect seeds for your garden!

When you finally find the perfect variety of tomato, sweet and delicious, and it grows well in your garden... learn how to save the seeds so you can grow it again next year!

How to save tomato seeds from your garden to plant next spring, using the method that mimics nature.

This post has been shared at some of my favorite blog hops.


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  1. I love this idea and while I do grow an heirloom garden, I have lots to learn yet in the way of seed saving from my own vegetables. Thanks for sharing!

    1. I still have a lot to learn about seed-saving too, but I have a great teacher who brain I pick every chance I get. :-)

  2. I have saved tomato seeds before simply by drying them off - is there a reason behind adding them to water and waiting for mould? Does it make them more likely to germinate?

    1. Yes, you'll have a higher rate of germination by fermenting the seeds. This is how nature "saves" tomato seeds - the fruit rots on the vine, falls to the ground, the seeds dry out and sit all winter, then come to life in spring.

    2. Thank you - I thought that might be the case.

  3. Thank you for this Kathi! Great tips. I love Sungold and Black cherries....yum!

  4. I love saving my tomato seeds! Alas, I haven't harvested a single ripe tomato this year. What a strange gardening season! Thanks for the info, Kathi!

    1. How strange and sad, Lisa, that you haven't had any ripe tomatoes this year!

    2. I finally picked some yesterday...I thought my tomatoes were a bust!

    3. At least you got some seeds from them, Lisa.

  5. Thanks, this will be useful. I have cherry tomatoes too... and it will be nice to propagate them in 2020. I only have one variety this year, but maybe I'll find a few others in local markets this next weekend.

  6. Tomato season is coming to an end here in the Northeast and it saddens me.... but this post gives me inspiration to already work towards next years garden. Thank you! Instructions are clear and easy to follow.

    1. Thank you, Jen - I'm glad it was helpful!

  7. Hi Kathi!
    I've never heard of fermenting the seeds before saving them, very interesting!! This was our first year growing tomatoes, so I'll have to remember this for next year. Thanks for sharing it with us on the Homestead Blog Hop!


    1. I hope you had a great crop of delicious tomatoes, Cherelle!


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