Helianthus 'decapetalus'
Thinleaf sunflower
A spreading plant with lance shaped to oval dark green hairy leaves with serrated edges. The yellow flowers are ten petalled and are produced on tallish stems that can be anything from light green to purple.
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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
Thinleaf sunflower
Latin name
Helianthus 'decapetalus'
type
Flowering plant
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
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Best time to plant
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When the plant will bloom
full grown dimensions
1.00 M
1.30 M
Helianthus 'decapetalus'
A spreading plant with lance shaped to oval dark green hairy leaves with serrated edges. The yellow flowers are ten petalled and are produced on tallish stems that can be anything from light green to purple.
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.
Planting Outdoors
From Early Spring TO Mid Spring
Plant out container grown plants.
Propagation by seed early
From Late Winter TO Early Spring
Sow seeds under glass for planting out in spring.
Propagation by seed outside
From Mid Spring TO Late Spring
Sow seeds into flowering position after last frost.
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.
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.
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