@sushiwaitress I usually collect them around this time, when the seeds start falling to the ground. I only collect a part of the seeds and the others simply fall to the ground and next year self-seed without me doing anything at all (the beauty of Nasturtiums). The seeds that I collected, I let them dry out on their own and keep them in a paper bag in the garage (or shed if you have). I plant them out in March next year.
8.6.2020 I planted the seeds outside very late (May) but have been diligent in watering them during the dry spells and now here they are, growing with confidence. I’ll need to keep an eye on aphids but birds are really helping out with that. I also sprinkled some other seeds among the nasturtiums, now I can’t remember what, waiting to be surprised 🤭😅