Common Sunflower seedling
Helianthus annuus
An herbaceous annual seedling featuring bright green, opposite-to-alternate leaves with cordate to ovate shapes, serrated margins, and a distinct rough texture on the surface.
- Light
- Full sun, requiring 6 to 8 hours of direct sunlight per day.
- Water
- Moderate watering needs. Water deeply when the topsoil dries out, allowing soil to dry slightly between watering sessions. Avoid prolonged drought or waterlogged soil.
- Growth
- An upright, fast-growing annual herbaceous plant with a single sturdy stem, reaching mature heights of 3 to 10 feet or more depending on the variety, with a spread of 1 to 3 feet.
Care instructions
Provide full sun exposures with at least 6 to 8 hours of direct light daily. Water consistently at the base when the top inch of soil feels dry, ensuring proper drainage. Apply a balanced, slow-release fertilizer sparingly during the early vegetative growth phase.
Growing details
Sunlight
Full sun, requiring 6 to 8 hours of direct sunlight per day.
Watering
Moderate watering needs. Water deeply when the topsoil dries out, allowing soil to dry slightly between watering sessions. Avoid prolonged drought or waterlogged soil.
Soil
Prefers well-draining loam, sandy, or clay soils with a neutral pH range between 6.0 and 7.5.
Hardiness zone
USDA Hardiness Zones 2 through 11, grown primarily as an annual across all zones.
Growth habit
An upright, fast-growing annual herbaceous plant with a single sturdy stem, reaching mature heights of 3 to 10 feet or more depending on the variety, with a spread of 1 to 3 feet.
Bloom season
Summer to early autumn, producing large composite flower heads with bright yellow ray florets surrounding dark center discs.
Propagation
Propagated exclusively from seeds sown directly into the soil after the last spring frost.
Common pests & issues
Susceptible to powdery mildew, rust, and fungal leaf spots in humid conditions. Pests such as aphids and beetles may occasionally affect young foliage.
Similar species
Jerusalem artichoke (Helianthus tuberosus), which has a perennial tuberous root system and smoother stems compared to the rough annual sunflower.