Let’s talk about the three amigos of sprouting speed: temperature, moisture, and seed freshness. Temperature is the VIP. Too cold (below 40°F) and your seeds will wait for spring like they’re waiting for a bus. Too hot (above 85°F) and they’ll literally stop working. Aim for that sweet spot: 65°F to 70°F.
Moisture is next. Keep the soil damp but not soggy. Think of a wrung-out sponge—not a swimming pool. If you overwater, the seeds rot and you get a tiny graveyard. If you underwater, they dry up and you get tiny fossils. Balance, my friend. Balance.
Seed freshness matters too. Old seeds (like, pre-pandemic old) can take longer or just give up. If your seeds are more than two years old, you’re basically asking a senior citizen to run a marathon. It might happen, but don’t hold your breath.
How to Check If They’re Coming
You don’t need X-ray vision. Just gently brush the soil aside after two days. If you see a tiny white root, you’re winning. If you see nothing, give it three more days. Patience is a virtue, said no lettuce ever, because lettuce is fast. But you’ll need a little patience anyway. Don’t poke the dirt every hour—you’ll disturb the babies. Let them do their thing.
Another trick: cover your seed tray with plastic wrap or a clear dome. This traps humidity and heat, turning your little seed bed into a spa. Lettuce seeds love a good spa day. Remove the cover as soon as you see sprouts, or they’ll get moldy—and nobody wants a moldy salad.
Lettuce Germination at Harry Brawner blog
