String of Pearls, Senecio rowleyanus Wisconsin Horticulture Faux Plants: Yes or Naux? Decoist Soil fertility Environment, land and water Queensland Government Cultivate a Healthier Future with Heirloom Seeds SurvivalGardenSeeds Black Henbane (Hyoscyamus niger) seeds This is how I harvest the seeds of my Marigolds. I let it dry in the sunset till it will really dry then keep it till next summer to plant it again. I'm always having fun doing these all every year.