Helianthus annuus
Sunflower
Helianthus is a group of annual and perennial flowering plants, which are members of the Asteraceae family. Most originate from North or Central America. They can be tall or short, and can be either annuals, tuberous or rhizomatous perennials. They typically have coarse leaves and usually have large daisy like flowers. Helianthus annuus is the common sunflower, and is a species Helianthus native to North America. It is grown as an annual plant, meaning it grows from seed, produces flowers and sets seed all in one growing season. After this, it would usually dies. Helianthus annuus typically grows during the summer and into early fall, with the peak growth season being mid-summer. Many cultivars are now available, of varying colours and heights, but are usually either yellow, brown, orange or white, and have dark brown centres where new seeds develop.
Contributed by @emmajane
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Full sun
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Occasional watering
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A little frost hardy: 32F (0°C)
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Moist and free draining
Common name
Sunflower
Latin name
Helianthus annuus
type
Annual
family
Asteraceae
ph
5.0 - 7.0 Acid - Neutral
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Light
Full sun
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Frost
A little frost hardy: 32F (0°C)
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Soil
Moist and free draining
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Water
Occasional watering
Plant & bloom calendar
-
Best time to plant
-
When the plant will bloom
full grown dimensions
0.50 M
4.00 M
Helianthus annuus
Helianthus is a group of annual and perennial flowering plants, which are members of the Asteraceae family. Most originate from North or Central America. They can be tall or short, and can be either annuals, tuberous or rhizomatous perennials. They typically have coarse leaves and usually have large daisy like flowers. Helianthus annuus is the common sunflower, and is a species Helianthus native to North America. It is grown as an annual plant, meaning it grows from seed, produces flowers and sets seed all in one growing season. After this, it would usually dies. Helianthus annuus typically grows during the summer and into early fall, with the peak growth season being mid-summer. Many cultivars are now available, of varying colours and heights, but are usually either yellow, brown, orange or white, and have dark brown centres where new seeds develop.
Planting Outdoors Spring
From Early Spring TO Mid Spring
Once the frosts have passed it is time to plant sunflowers into the garden. If planting straight into the soil, look for a sunny position with shelter from winds. A position against a wall is usually best. Try to avoid sandy soil and rich-free draining soil will be most successful. Plant the seeds about 30cm apart and about 3cm below the surface. Sunflowers do like a lot of water so to get the best out of your plant try to water it every day, but keep and eye on the soil and roots as constantly damp and soggy roots will make the plant unstable and could lead to root rot.
Propagation by seed outdoors
From Mid Winter TO Early Spring
Once the frosts have passed it is time to plant sunflowers into the garden. If planting straight into the soil, look for a sunny position with shelter from winds. A position against a wall is usually best. Try to avoid sandy soil and rich-free draining soil will be most successful. Plant the seeds about 30cm apart and about 3cm below the surface. Sunflowers do like a lot of water so to get the best out of your plant try to water it every day, but keep and eye on the soil and roots as constantly damp and soggy roots will make the plant unstable and good lead to root rot.
Flowering season
From Early Summer TO Early Autumn
Sunflowers flower throughout the hottest part of the summer. Their flower heads famously follow the sun throughout the day and hang down over night! A stunning site throughout many regions of mid and southern France and Italy where they are farmed for the oil. Very bee friendly.
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