QuestionsHow to growFlowersSummer colour from seednasturtim seeds 0 Vote Up Vote Down mary hynes asked 15 years ago When is the best time to save nasturtim seedsis it when they are green and ripeor when they go brown? 1 Answers 0 Vote Up Vote Down Gerry Daly Staff answered 7 years ago Save only the brown corky ones, and you can wait until the frost has killed the plants. Or leave them to spring up by themselves next year, or save some and allow the rest to self-sow.