The case for letting cilantro bolt

Cilantro bolting isn't a mistake you made. It's cool-weather-only by nature — heat is what makes it throw a flower stalk and quit on leaf production, often within days once summer temperatures set in. That's exactly why the growing windows for it sit in the cool shoulders of the year: sown a few weeks before last spring frost, and again in late summer ahead of the fall frost, with a fresh round going in every couple of weeks through each window. One planting only gives you three or four weeks of good leaf before it's done, which is the real reason succession sowing matters here more than almost any other herb.

So when a planting bolts in the heat, the useful move is to stop treating it as a problem and start treating it as the next crop. Let the flowers finish and the seed heads dry on the plant until they turn tan and papery — that's coriander, the same plant's dried seed, and it's a completely different, warm, citrusy spice from the fresh leaf. Snip whole seed heads into a paper bag, let them finish drying somewhere airy, then rub them between your palms to free the round seeds from their husks.

Don't collect every seed, though. Cilantro self-seeds generously if you leave a portion of the seed heads to shatter naturally into the bed. Those seeds ride out the season in the soil and germinate on their own the moment conditions turn cool again — free seedlings, no tray, no transplanting (which cilantro resents anyway, thanks to a taproot that doesn't like being disturbed). It's the closest thing to a self-perpetuating herb patch you'll get in a vegetable garden.

The one time to skip the seed-saving plan and just resow is when you need leaf now, not seed later. If a heat wave has bolted your whole planting and you're out of usable cilantro, pull it, compost what you don't want for seed, and start a fresh direct-sown round timed for the next cool window rather than waiting on volunteers that may not show up on your schedule.

Either way, the calendar already knows when your next cilantro window opens. Take a look and get the next round in before the heat decides for you.