How to Save Tomato Seeds
The fermentation method produces seeds that germinate better and last longer
Before You Start
Only save seeds from open-pollinated or heirloom tomatoes. Seeds from hybrid varieties (F1) won't produce plants true to type.
Choose your best, healthiest tomatoes from your best plants. You're selecting for traits you want!
Step-by-Step: Fermentation Method
Choose Ripe Tomatoes
Select fully ripe (or slightly overripe) tomatoes from healthy, vigorous plants. Cut the tomato across the middle to expose the seed cavities.
Scoop Seeds Into a Jar
Squeeze or scoop the seeds and gel into a clean glass jar. Include some of the juice and pulp. Add a splash of water if needed to cover seeds.
Ferment for 2-4 Days
Cover loosely (not airtight) and leave at room temperature. Stir once daily. A moldy film will form on top - this is normal! It means fermentation is working.
Know When It's Done
Fermentation is complete when: mold covers the surface, mixture smells funky, and viable seeds have sunk to the bottom. Usually 2-4 days.
Rinse Seeds Clean
Add water to the jar, stir, and pour off floating debris and bad seeds. Repeat until only clean seeds remain at the bottom. Drain through a fine strainer.
Dry Thoroughly
Spread seeds on a coffee filter, paper plate, or screen. Let dry for 1-2 weeks in a warm, well-ventilated area. Stir daily to prevent clumping.
Store Properly
Once completely dry (seeds should snap, not bend), store in labeled paper envelopes inside an airtight container. Keep cool and dark.
Frequently Asked Questions
Why do I need to ferment tomato seeds?
Fermentation removes the gel coating that inhibits germination and may contain disease. It mimics what happens naturally when tomatoes fall and rot on the ground. Fermented seeds germinate better and store longer.
How long should I ferment tomato seeds?
Ferment for 2-4 days at room temperature. Stop when you see a layer of mold on top and seeds sink to the bottom. Don't over-ferment or seeds may start to germinate.
Can I save seeds from hybrid tomatoes?
You can, but the plants won't grow 'true to type' - offspring may vary from the parent plant. For reliable results, save seeds only from open-pollinated or heirloom varieties.
How long do saved tomato seeds last?
Properly dried and stored tomato seeds remain viable for 4-10 years! Store in airtight containers in a cool, dark place. Refrigerator storage extends viability even longer.