Do compost heaps smell bad?
A correctly built and managed compost heap will not smell of anything except a sweetish smell not dissimilar to freshly cut grass. Badly built heaps that do not allow air to circulate or are built exclusively of one material, for instance grass mowings, will not break down correctly and will smell bad. It is important when building your compost heap that you include many different types of plant material mixed well together and aerated. A compost activator should be added and mixed into the heap. Propriety activator pellets can be bought from garden centres and DIY stores, but a natural activator can be made by adding fresh stinging nettles throughout the pile or adding fresh horse manure. This will not make the heap smell bad, but actually make it smell good!