Let It Bolt: Free Seed from Lettuce and Cilantro

Every July I watch at least one person in the neighborhood Facebook group post a sad photo of their lettuce sending up a two-foot flower stalk, asking what went wrong. And every July I have to physically stop myself from commenting “nothing, leave it alone, that’s free seed.”

Saving seed from bolted lettuce and cilantro is genuinely the cheapest legitimate seed source you will ever find. Zero dollars. The plants already did the hard work. You just have to not ruin it.

Why Your Plants Are Doing This (And Why That’s Good)

When lettuce bolts, it’s responding to day length and temperature signals. Basically the plant clocking that summer is here and it’s time to reproduce before it dies. The bitter taste that shows up at the same time isn’t spite. It’s the plant redirecting energy from leaf production into seed production. Cilantro does the same thing even faster, which is why it feels like it bolts if you look at it wrong.

Here’s the nerdy bit: the flower stalks on both plants are self-fertile, meaning each flower can pollinate itself. Lettuce especially almost never cross-pollinates with neighboring varieties because the pollen releases inside a closed flower before it even opens. Which, now that I think about it, is a pretty elegant system for a plant that wants to pass on its exact genetics.

That last part matters. We’ll come back to it.

What to Do With Bolted Lettuce

Don’t pull it. I know it looks scraggly. I know it’s taking up space. Leave it.

The flowers are small and yellow and honestly kind of pretty if you squint. After they fade, each one forms a little seed head with a feathery tuft on top, like a tiny dandelion. The seeds are ready when those tufts appear and the base of the seed head is dry and tan, not green.

The classic move is to take a paper bag, hold it loosely over the seed head, and give the stalk a gentle shake. Ripe seeds drop right off. Or you can tie the paper bag around the whole head while it’s still on the plant and let it finish drying inside the bag, which catches anything that drops on its own. I’ve done it both ways, and I’ll be honest, I tried the shake method first in a light breeze and lost half of them into the grass. The tie-and-wait method loses fewer seeds when it’s windy, which is basically always here in July.

Let the seeds air dry for another week or two in a cool spot before sealing them up. Moisture is the enemy of stored seed. (The science version: residual moisture accelerates enzymatic breakdown inside the seed, wrecking germination rates. The practical version: don’t put wet seeds in a jar.)

What to Do With Bolted Cilantro

Cilantro bolts so fast that most people are already annoyed by the time they could do anything about it. Good. That annoyance is your seed budget working for you.

Once the flowers appear, you’re waiting on the seeds, which are technically coriander. Small, round, in pairs, green at first and then tan when they’re done. The whole plant usually ripens unevenly, so instead of trying to pick individual seeds, just cut whole stems when about two thirds of the seeds look dry and drop them into a paper bag or a bowl. Hang the bag upside down in a dry spot for a week and let gravity and time finish the job.

You’ll end up with more cilantro seed than you can use in two seasons. Give some away. Or save extra for cooking because coriander is genuinely good and costs real money at the grocery store. So.

The One Caveat Worth Knowing

This whole method only works reliably with open-pollinated varieties. If you planted a hybrid (anything labeled F1 on the seed packet), the seeds you save might not grow true to the parent plant. You could get something totally different, or something weaker, because F1 hybrids are bred from two distinct parent lines and the offspring don’t reliably carry the same traits.

Most grocery store cilantro starts from open-pollinated seed. A lot of common lettuce varieties like Black Seeded Simpson or Buttercrunch are open-pollinated too. Check your original seed packet. If it says F1, save the seeds anyway for the experience, just don’t bet your whole garden on them coming out the same.

I saved seed from a mystery lettuce once that I think came from a nursery six-pack, one of those $3.47 mixed flats from Sky Nursery. Planted it the next spring and got something vaguely lettuce-shaped but also kind of not. Ate it anyway. The cheapest thing in this garden is my standards.

Storage and What Comes Next

Paper envelopes in a cool dry drawer work fine. Label them with the variety and the year because you will absolutely not remember in March. Lettuce seed stays viable for about two to three years. Cilantro is similar. After that, germination rates drop off and you end up replanting whole trays for twelve survivors, which I’ve done, which is annoying.

Come February when the seed catalogs show up and everyone’s dropping thirty dollars on packets, you’ll have a little stash of free seed sitting in your drawer just waiting. Lettuce turnip the beet? No. But lettuce save some money. Yeah, I went there.

Photo by Gigi on Unsplash