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Sunflowers (Helianthus annuus) are a treasure of summertime. They typically begin blooming in the mid-summer and can persist into early fall. The flowers, which stretch around 3 to 6 inches across on average, have a broad central disk surrounded by short, yellow petals. Sunflowers grow on a hairy, sturdy, upright stem that can be several feet high. The stems can hold a single flower or be branched with multiple blooms. Rough, hairy, oval to triangular leaves grow along the stem. These flowers are annual, meaning they complete their growth cycle in one year. You should plant them in the spring after the garden soil has warmed to at least 55 degrees Fahrenheit.
Sunflower Care
The only mandatory requirements for sunflowers are a sunny location and well-drained soil. Select an area sheltered from strong winds that might topple these tall plants if possible. It can be helpful to plant sunflowers in groups to support each other against wind and rain. Growers often have to stake their sunflowers, especially the tall varieties, to keep them growing upright. The plants can become very top-heavy when in bloom. Planting sunflowers along a fence is the easiest way to stake them. Bamboo stakes are also strong enough to keep them upright. Use care when inserting the stakes so you don’t damage the plant’s roots.
Sunflowers don’t like to compete with weeds, so keep the garden clean. Mulching around your sunflowers will help maintain soil moisture and weed suppression. Furthermore, wildlife is often attracted to sunflower seedlings. So it’s best to protect seedlings with row covers or screening, removing the cover once the plants are 1 to 2 feet tall.
Light
For the best flowering and sturdiest stems, plant your sunflowers in full sun, meaning at least six hours of direct sunlight per day. Because they are heliotropic (their flower heads follow the sun), ample sun exposure will help sunflowers remain straight rather than bending toward the direction where the light is strongest.
Soil
Sunflowers will grow in almost any soil, including poor, dry soils. However, they thrive in well-drained soil that contains a good amount of organic matter.
Water
Although tolerant of dry conditions, watering sunflowers regularly promotes blooming, as flowering often reduces during periods of drought. Allow the top 1 to 2 inches of soil to dry out between waterings. If your sunflowers are drooping and the soil is dry, that’s often a sign they need more water.
Temperature and Humidity
Optimal temperatures for growing sunflowers are between 70 and 78 F. Still, they tolerate high heat as long as their moisture needs are met. Sunflowers can handle somewhat chilly but sunny environments. They also tolerate high humidity but must have well-draining soil and good air circulation to prevent root rot and other diseases.
Types of Sunflowers
Helianthus annuus ‘Russian Giant’

Helianthus annuus ‘Teddy Bear’

Helianthus annuus ‘Giant Sungold’

Helianthus annuus ‘Autumn Mix’

Helianthus annuus ‘Italian White’

SOURCE: THE SPRUCE























