Bev has responded to last week’s column about fire ash as a garden fertiliser. “There are a couple of kitchen waste products that are also good fertilisers for the garden.  Egg shells are high in calcium so do the same job as lime. I store the shells for a week then bake them for about 20 minutes in a moderate oven (after the roast comes out). I grind them up into a fine powder and spread directly over a garden bed. Coffee grounds are another. They have high nitrogen content so I spread them on leafy crops or add them to our compost bin.”