The optimal timing for initiating nasturtium seed germination inside hinges on local climate conditions and desired bloom period. Generally, a period of four to six weeks before the last anticipated frost proves suitable for sowing seeds indoors.
Starting seeds indoors provides advantages such as extending the growing season and safeguarding delicate seedlings from harsh weather, pests, and diseases. This practice results in healthier, more robust plants that establish more quickly when transplanted outdoors. Historically, indoor seed starting allowed gardeners in colder regions to cultivate plants not naturally suited to their environment.