Have you seen the latest seed-starting “hacks” doing the rounds on social media? Cardboard boxes, tin foil, hot water bottles, seedlings… honestly, you couldn’t make it up. Let’s talk facts In a glasshouse, even wrapped in standard bubble wrap, a hot water bottle only stays usefully warm for a few hours. To keep heat-loving seeds like tomatoes or chillies anywhere near their ideal temperature, you’re realistically refilling the hot water bottle at least twice a day. The maths (UK electricity pri