Sunflower
Also known as
Common Sunflower, Annual Sunflower
Keep this plant’s care guide close at hand.
Get the appAbout Sunflower
Helianthus annuus, commonly known as the Sunflower, is distinguished by its large, bright yellow flowers and towering heights, which can reach up to 3 meters. Each flower is actually a composite of numerous small flowers or florets, which are centrally clustered and surrounded by large, petal-like rays. Sunflowers are renowned for their heliotropism; young flowers track the sun from east to west, which maximizes their energy absorption. Originally native to North America, sunflowers are now cultivated globally, primarily for their seeds, which are a source of oil and snack food. Beyond their agricultural value, sunflowers are also popular in gardens and as cut flowers due to their vibrant appearance and large size.
Taxonomy
Properties & Requirements
How to care for Sunflower
Water
Water sunflowers deeply but infrequently to encourage deep root growth. The soil should be allowed to dry out slightly between waterings. During hot, dry weather, water more frequently to keep the soil moist but not waterlogged, as sunflowers are drought-resistant but perform best with consistent moisture.
Light
Full sunlight is ideal for sunflowers, as they require a minimum of 6 to 8 hours of direct, unfiltered sunlight per day. This maximizes their growth and flowering potential.
Nutrients
Sunflowers thrive with regular fertilization, especially phosphorus to promote strong root development. Apply a balanced fertilizer, such as a 10-10-10 NPK ratio, periodically through the growing season to support their rapid growth and large flower production. Avoid over-fertilization, which can lead to excessive foliage at the expense of flowers.
Temperature
Sunflowers prefer warm conditions and are best grown in temperatures between 20°C to 30°C (68°F to 86°F). They are fairly heat tolerant but can be damaged by early frosts, so plant after the last frost date in your area.
