Charles Dowding on Instagram: "Mustard Sinapis alba for a fast growing cover of leaves and stems, plus plenty of roots that you never see, all adding organic matter to the soil. It’s free energy from the sun through photosynthesis at the backend of a year. Here it’s zone 8 and last sowing date for worthwhile growth is around 10th October. See my 2026 calendar of sowing dates for all vegetables and one or two cover crops like this. Filmed @nicolalsmith at Homeacres #mustard #covercrops #nodig #gr