The Real Reason Lettuce Won't Sprout in an Australian Summer (The Science)
You sow a tray of lettuce in the middle of an Australian summer, keep it watered, and… nothing. Two weeks later the punnet is still bare soil. It's not old seed and it's not your fault — lettuce has a built-in switch that simply shuts germination off in the heat. This video explains the real reason lettuce won't sprout in an Australian summer — the science of that switch, and the simple, evidence-based ways to flick it back on so your seed comes up fast and even. It's called thermo-inhibition. Lettuce seed is wired to germinate in cool conditions, and once the soil sits above roughly 25–30°C the seed goes dormant on purpose — nature's way of stopping it sprouting into weather that would kill the seedling. Understand that trigger and germinating summer lettuce stops being a guessing game. In this video: • What thermo-inhibition is, and the soil temperature that triggers it • Why fresh seed and good watering still won't fix a hot punnet • Pre-chilling and priming seed before you sow • Sowing in the cool of the evening, and germinating somewhere cooler indoors • Keeping the soil surface cool and damp until the seedlings are up • Pelleted vs raw seed, and which suits summer sowing • A succession routine so you always have seedlings ready to plant There's also an ergonomic tip for starting seed at bench height, with no bending over trays on the ground. ⏱️ TIMESTAMPS (adjust to your real times) 00:00 The problem: a punnet that just won't come up 01:20 Why it's not old seed or bad luck 03:00 The science of thermo-inhibition 05:30 Pre-chilling and priming your seed 08:00 Sowing time and germinating somewhere cooler 10:30 Keeping the soil surface cool and damp 12:30 Pelleted vs raw seed for summer 14:00 An ergonomic, bench-height seed setup 15:30 Recap + what to watch next 🔗 RESOURCES MENTIONED • Seed pre-chill & priming steps: [LINK AL RECURSO] • Our climate-zone planting calendar: [ENLACE A TU WEB] • Heat-tolerant variety shortlist: [LINK] 📺 More channels for Australians 65+: → Finances: @AussieSeniorFinance → Travel: @AussieSeniorTraveller → Rights: @AussieSeniorRights → Food: @AussieFoodTruth If this solved your bare-punnet mystery, subscribe and tap the bell — a new science-backed Australian gardening video lands every Tuesday. Tell us in the comments how hot your soil gets when you're trying to sow. #AussiePatch #LettuceSeeds #AustralianGardening #GrowYourOwn #VeggieGarden
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