Compost is a natural way to improve your soil, and strong soil produces healthy plants. But how do you maximise your compost and keep your worms healthy? What NOT to put in your compost: Citrus and onions are very bad for worms and will slow down composting development. Eucalyptus leaves that still contain their strong smell. Extreme amounts of dairy or meat. Coloured magazines and other prints, the ink can often be toxic. What you CAN put in your compost: Twigs and branche