Plant Profile: Helianthus

There are 150 different species of sunflowers, primarily found in North America. These plants can be either annuals or perennials, characterized by their coarse, sandpapery leaves and vibrant, daisy-like flowers that come in a range of colors. Notable examples include H. annuus, the giant sunflower known for its seeds and oil, and H. tuberosus, whose roots produce Jerusalem artichokes. While all species tend to grow tall and some may become invasive due to their ability to self-seed, their bright blooms in summer and fall more than compensate for any potential issues.

Most sunflowers thrive in moist soil, although certain species can adapt to areas with poor drainage.

Regarding the production trials of Helianthus cultivars, there are generally no significant issues with insects, diseases, or other plant-related problems. However, the tall stature and large flowers of these plants may necessitate some form of support.