Forest Girl Farm

Every summer, gardeners toss the best genetics in their garden straight into the compost pile — seeds from the earliest tomato, the lettuce that held out longest before bolting, the pea vine the aphids never touched. Late July is exactly when a lot of that seed is ready to save, and it costs nothing but five quiet minutes in the garden.

Which Seeds Are Actually Worth Saving Right Now?

By this point in the season here in zone 9b, several crops are already offering up seed if you know where to look. Here’s what I let go to seed on purpose instead of pulling:

• Peas and beans — leave a few pods on the vine until they turn brown and papery, then shell them out.
• Lettuce — once it bolts and sends up a flower stalk, let it go to seed instead of yanking it; the fluffy seed heads are ready in about two to three weeks.
• Tomatoes — save from the earliest, healthiest fruit of the season, not the last stragglers.
• Sunflowers — let the back of the flower head turn brown and papery before cutting it to dry.
• Cilantro and dill — the seed heads that form after bolting are just as useful in the kitchen as they are in next year’s seed tray.

Which Seeds Will Disappoint You Next Year?

Two categories will waste your time. Skip saving from these, or go in knowing what you’re getting:

• Hybrid (F1) varieties — anything labeled hybrid on the seed packet won’t grow true. The plant you get next year is a genetic grab bag, not a copy of the parent.
• Squash, cucumbers, and corn — these cross-pollinate freely with other varieties in the neighborhood, including a neighbor’s garden a few hundred feet away. Unless you know exactly what else was blooming nearby, the seed is a gamble.

How Do You Actually Save and Store Them?

The process is nearly the same across the board: let the seed mature and dry on the plant as long as possible, finish drying it indoors out of direct sun for another week or two, then store it somewhere cool, dark, and dry. An old glass jar or paper envelope in a closet works better than anything fancy. A few specifics worth knowing:

• Pea and bean seed stays viable for about 3 years stored properly.
• Tomato seed, fermented in water for a few days to strip the gel coating and then fully dried, can last 4 to 6 years.
• Lettuce seed drops off fast — closer to 2 years — so use it or lose it.
• Always label with the variety and the year. “Tomato, 2026” tells you nothing useful three seasons from now.

Up here under the redwoods, the fog rolls in and out enough that bolting and ripening timelines shift plant to plant even within the same bed, so I check my earliest-to-bolt lettuce and earliest-ripening tomatoes every few days this time of year rather than waiting for a single big harvest day. A five-minute walk through the garden with an envelope in your pocket is really all seed saving takes.

What’s going to seed in your garden this week?