Doronicum Flower Seeds are a hard seed, just as an Acacia or Macadamia nut is. They require scarifying in order to germinate. These seeds have a hard protective coating that needs to be broken in order for water to penetrate the seed and start the germination process. Scarifying is the act of breaking that hard, protective outer layer. Most gardeners will use a file or sandpaper to rough up the outside layer, while some will use a knife to make a small nick in the coating. Freezing the seeds may accomplish this, as this is how it is done in nature, but chemical means can also be used, such as soaking the seeds in vinegar. Just cover the seeds in a glass container with vinegar, stir them gently and allow them to soak for about 10-minutes. Remove them, rinse them and then sow them immediately. Sow indoors in February, outdoors in April, covering them as Doronicum needs darkness to germinate. At 50 to 60°F, germination will normally take about 14 days. Seeds should be planted or thinned to about 16-inches once the first true leaves appear.