The sixth edition of the Celestial Planting Calendar explores a range of topics focused on the theme of light. The calendar starts off with the light ether and Hugh Courtney’s article on Horn Silica. Jaspal Chattha’s teaching on Barrel Compost expands the reader’s appreciation for how microbes use raw materials of cow manure to enhance nutrient uptake by plant life. As seeds are packets of light, the theme of light continues in Peter Fuller’s article on biodiversity and seed propagation. His practical teachings apply to all levels of nature, whether it be in a garden, a farm or a forest.