To save seeds from spinach, let 2-3 of your best plants bolt and produce tall seed stalks instead of picking all the leaves. Don't pull these plants when they start flowering. Let them finish their full life cycle. The seeds form in small clusters along the stalk and are ready to collect once they turn brown and dry.
I saved my first batch of spinach seeds two seasons ago. The whole process took about 6 weeks from the first sign of bolting to dry seed pods I could pick off the stalk. I kept four plants going at once so they could pollinate each other in the wind. The seeds I saved from that batch sprouted better the next spring than the store-bought packet I used beside them.
Here's why you need more than one plant for this spinach seed saving guide to work. Spinach is a dioecious plant, which means individual plants are either male or female. Male plants make pollen and female plants make seeds. Wind carries the pollen between them. If you only let one plant bolt, you might end up with a male that makes no seeds at all. Keep 3-4 plants flowering at the same time to be safe.
Penn State Extension notes that spinach seeds lose their punch faster than most veggie seeds. Fresh seeds you save at home sprout much better than old packets that sat on a store rack for a year or more. That's a big reason to save your own. You know your seeds are fresh and you know they came from plants that did well in your soil and climate.
Let Your Plants Bolt and Flower
- Pick the best plants: Choose your 2-3 strongest spinach plants with thick leaves and late bolting habits. These traits pass on to the next batch.
- Stop harvesting: Leave these plants alone once you see a center stalk forming. Your plant needs all its energy to make viable seed pods.
- Wait it out: The full flowering and seed-making process takes about 6 weeks from the first bolt sign to dried pods ready for picking.
Harvest and Thresh Your Seeds
- Timing: Start collecting spinach seeds when the pods on the stalk turn brown and feel dry to the touch. Green pods aren't ready yet.
- Threshing method: Rub the dried pods between your hands over a bowl to break them apart. The small round seeds fall to the bottom for easy sorting.
- Clean up: Blow gently across the bowl to remove bits of dried pod and chaff. You want clean seeds with no plant matter stuck to them.
Store Seeds for Future Planting
- Container choice: Put your clean dry seeds in paper envelopes labeled with the variety and date. Avoid plastic bags because trapped moisture causes mold.
- Storage spot: Keep your seed envelopes in a cool dry place like a drawer or closet. Temperatures below 70°F (21°C) keep seeds viable longer.
- Shelf life: Your saved spinach seeds stay good for 3-5 years in proper storage. Test a few seeds on a wet paper towel each spring before planting.
In my experience, the trickiest part of collecting spinach seeds is timing the harvest. Pick too early and the seeds won't sprout. Wait too long and the wind knocks them off the stalk. I check my seed stalks every other day once the pods start turning brown. When they feel papery and the seeds inside look dark, it's time to cut the whole stalk and bring it indoors to finish drying.
Saving your own seeds costs nothing and gives you a fresh supply each year. The seeds from your best plants carry traits that work in your garden. You'll spend less on seed packets and grow spinach that's tuned to your local conditions. Start with a few plants this season and you'll have more seeds than you can use by fall.
Read the full article: Growing Spinach: 7 Key Steps
