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Description
Helianthus Angustifolius, commonly known as Swamp Sunflower, is a species of sunflower native to the southeastern United States. This perennial plant belongs to the Asteraceae family and can grow up to 8 feet tall with a spread of 2-4 feet. It has a clump-forming habit and produces numerous bright yellow flowers that bloom from late summer to early fall.
Taxonomic Information
| Domain | Eukaryota |
| Kingdom | Plantae |
| Phylum | Spermatophyta |
| Class | Magnoliopsida |
| Order | Asterales |
| Family | Asteraceae |
| Genus | Helianthus |
| Species | Angustifolius |
Appearance
Swamp Sunflower has narrow lance-shaped leaves that are 3-6 inches long, arranged alternately on the stem, and have a rough texture. The stem is sturdy and covered with fine hairs. The flowers, which are 2-3 inches wide, have bright yellow petals and a dark center disk. They bloom in clusters at the top of the stem and attract bees and butterflies.
Care Guide
Water: Helianthus Angustifolius prefers moist soil, so regular watering is essential. However, make sure not to overwater as this can lead to root rot.Fertilization: This plant benefits from regular fertilization during the growing season. Use a balanced fertilizer that is high in nitrogen.Soil: Swamp Sunflower thrives in nutrient-rich, well-drained soil. If your soil is poor, amend it with organic matter such as compost.Sunlight: This plant needs full sun to thrive. Make sure it receives at least 6 hours of direct sunlight per day.Hardiness Zones: Helianthus Angustifolius is hardy in USDA zones 6-9.
Common Pests & Diseases
Swamp Sunflower is relatively pest and disease-resistant. However, it may occasionally be attacked by aphids, spider mites, or whiteflies. These pests can be controlled with insecticidal soap or neem oil. In terms of diseases, this plant can be susceptible to fungal diseases such as powdery mildew or rust. Ensure good air circulation around the plant and avoid overhead watering to prevent these diseases.
Habitat
Helianthus Angustifolius is commonly found growing in wetlands, floodplains, and other low-lying areas. It prefers moist soil and full sun but can tolerate some shade. This plant is native to the southeastern United States and is often used in wetland restoration projects to stabilize soils and provide habitat for wildlife.
Question and Answer
Q: Can I grow Helianthus Angustifolius in a container?A: It is possible to grow Swamp Sunflower in a container, but it requires a large pot and regular watering to keep the soil moist.Q: Are there any special pruning requirements for this plant?A: Helianthus Angustifolius does not require regular pruning. However, you can remove spent flowers to encourage more blooms.Q: Can I divide this plant?A: Yes, you can divide Swamp Sunflower in the spring or fall. Use a sharp spade to cut through the clump and replant the divisions in well-draining soil.Q: Is this plant toxic to pets?A: Helianthus Angustifolius is not toxic to pets. However, ingesting large quantities of any plant material can cause digestive upset.
Related Plants
Other plants in the Helianthus genus include:
- Helianthus annuus (Common Sunflower)
- Helianthus maximiliani (Maximilian Sunflower)
- Helianthus tuberosus (Jerusalem Artichoke)
References
- “Helianthus angustifolius.” Missouri Botanical Garden, www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?kempercode=c530.
- “Swamp Sunflower.” North Carolina State Extension, content.ces.ncsu.edu/swamp-sunflower.
- “Helianthus angustifolius.” Lady Bird Johnson Wildflower Center, www.wildflower.org/plants/result.php?id_plant=hean3.
