If you’ve ever stood in a garden centre, squinting at a 20kg bag of grass seed and wondering, “Will this be enough?” you’re not alone. Let’s explore how far that bag will stretch, and what factors might influence your results. The Average Expected Coverage of Seed A 20kg bag of grass seed typically covers 400 to 800 square metres, depending on the type of grass and its intended use. Here’s a rough breakdown: Seeding a new lawn. Around 35 to 50 grams per square metre is recommended. Overseeding an existing lawn. Requires less seed, around 20 to 30 grams per…