I'm in my third year of trying to grow lettuce, and it's been frustrating as I've failed each time. This year, I oversaw my seedling trays and added humidity domes, but still no luck. I'm planning to buy fresh seeds, but I'm worried I might be making some mistakes. I usually start them in 6-cell containers, keeping the tops moist and ensuring they have plenty of warmth and light. Any suggestions that could help me succeed with my lettuce?
3 Answers
One key thing to remember with lettuce seeds is that they're tiny and need just a light sprinkle on top of the soil. Avoid burying them too deep, as they won’t push through larger soil pieces. Also, while humidity domes can help, I’ve found lettuce does fine with just moisture on top without needing the dome. Just use a spray bottle to keep the top of the soil moist instead!
Make sure your lettuce seeds are fresh, as old seeds can significantly reduce germination rates. I personally sow them right on top of the soil without covering them, as they really do need light to sprout well. I’ve had success just putting something clear over them until they germinate without too much fuss. Using a heat mat can also help, but double-check if your temps are suitable - generally, below 75°F is best for lettuce.
Since you’re in Virginia, why not try direct sowing your seeds outdoors around late March? Lettuce grows quickly and thrives in cooler weather, which might just be easier than starting them inside. If you do continue with indoor planting, keep the seeds very close to the surface and maybe ditch the humidity dome. Light is crucial for them to germinate! I also recommend lightly spritzing the soil instead of soaking the whole tray to avoid mold.