Common Sunflower seedling
Helianthus annuus
An upright herbaceous annual seedling featuring bright green, opposite-to-alternate leaves with serrated margins and a slightly rough, textured surface.
- Light
- Full sun, requiring six to eight hours of direct sunlight daily
- Water
- Moderate watering requirements. Allow soil to dry slightly between watering sessions; avoid waterlogged conditions.
- Growth
- Fast-growing herbaceous annual with a single, unbranched or branching erect stem, reaching mature heights of 3 to 10 feet depending on the specific cultivar.
Care instructions
Provide full sun exposure for at least six to eight hours daily. Water deeply when the top inch of soil becomes dry, ensuring the growing medium is well-drained. Apply a balanced, low-nitrogen fertilizer sparingly during early growth stages to encourage sturdy stems and eventual flower production.
Growing details
Sunlight
Full sun, requiring six to eight hours of direct sunlight daily
Watering
Moderate watering requirements. Allow soil to dry slightly between watering sessions; avoid waterlogged conditions.
Soil
Prefers well-draining loamy or sandy soils with a neutral pH between 6.0 and 7.5.
Hardiness zone
Cultivated as an annual across USDA zones 2 through 11
Growth habit
Fast-growing herbaceous annual with a single, unbranched or branching erect stem, reaching mature heights of 3 to 10 feet depending on the specific cultivar.
Bloom season
Flowers from mid-summer to early autumn, producing large composite flower heads with bright yellow ray florets surrounding a central disc.
Propagation
Propagated exclusively from seeds sown directly into the soil after the last spring frost.
Common pests & issues
Susceptible to fungal leaf spots, powdery mildew, and rust in overly humid conditions. Pests such as aphids and caterpillars may occasionally target the foliage.
Similar species
Other members of the Asteraceae family in the seedling stage, distinguishable by leaf shape, arrangement, and the distinct rough texture of the foliage characteristic of Helianthus species.