The Swamp Sunflower or Narrow Leaf Sunflower is a tall, striking plant for the perennial border or naturalistic meadow garden. Bright yellow, 2½” daisy-like flowers grow on 6’ stems clothed in rich green needle-like leathery foliage. The clusters of flowers standout when viewed at a distance or close up. Helianthus angustifolius lives in a wide range of soil moisture conditions. Swamp sunflower is special because it is among the last plants to bloom in late autumn. It is a native perennial member of the Compositae or sunflower family and is a favorite of gardeners. It has deep green, simple narrow leaves and it blooms profusely with happy yellow flowers from late summer to fall. Narrow-leaf sunflowers are salt-tolerant and can tolerate water-logged soil so they are great for coastal gardens. This plant is moderately resistant to damage from deer. It is a great late-nectar plant for butterflies. Songbirds, ruffed grouse, quail and small mammals are attracted to the seeds. Swamp sunflower prefers moist soils and full sun but tolerates poor soils on the dry side.
1. Prepare a mixture of half potting soil and half sand, perlite or vermiculite. Water the mixture so that it is moist but not wet.
2. Put the seeds on the soil.
3. Cover the seeds with a thin layer of soil.
4. Water the seeds.
5. Place the pots in an area with warm temperatures in full sun or part shade.
6. When the seedlings are a few inches tall, they can be transplanted.