Helianthus, Double False Sunflower, Perennial Sunflower, Thin-Leaved Sunflower 'Loddon Gold'

Helianthusdecapetalus

Family
Asteraceae (ass-ter-AY-see-ee)
Genus
Helianthus (hee-lee-AN-thus)
Species
decapetalus (dek-uh-PET-uh-lus)
Synonym
Helianthus multiflorus
Sun Exposure
Full Sun
Foliage
Herbaceous
Velvet/Fuzzy
Height
4-6 ft. (1.2-1.8 m)
Spacing
18-24 in. (45-60 cm)
Hardiness
USDA Zone 4a: to -34.4 °C (-30 °F)
USDA Zone 4b: to -31.6 °C (-25 °F)
USDA Zone 5a: to -28.8 °C (-20 °F)
USDA Zone 5b: to -26.1 °C (-15 °F)
USDA Zone 6a: to -23.3 °C (-10 °F)
USDA Zone 6b: to -20.5 °C (-5 °F)
USDA Zone 7a: to -17.7 °C (0 °F)
USDA Zone 7b: to -14.9 °C (5 °F)
USDA Zone 8a: to -12.2 °C (10 °F)
USDA Zone 8b: to -9.4 °C (15 °F)
USDA Zone 9a: to -6.6 °C (20 °F)
USDA Zone 9b: to -3.8 °C (25 °F)
Danger
Handling plant may cause skin irritation or allergic reaction
Bloom Color
Bright Yellow
Bloom Time
Mid Summer
Late Summer/Early Fall
Other Details
Category
Perennials
Water Requirements
Average Water Needs; Water regularly; do not overwater
Foliage Color
Blue-Green
Where to Grow
Bloom Characteristics
Flowers are good for cutting
This plant is attractive to bees, butterflies and/or birds
Bloom Size
Other details
Soil pH requirements
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)
7.9 to 8.5 (alkaline)
Patent Information
Propagation Methods
By dividing the rootball
From seed; direct sow after last frost
Seed Collecting
Collect seedhead/pod when flowers fade; allow to dry
Regional

This plant is said to grow outdoors in the following regions:

Peoria, Illinois

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Gardener's Notes:

2
positives
0
neutral
0
negative
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M
Peoria, IL (Zone 5b) | May 2011 | positive

This is a lovely plant. The stems are strong and sturdy and
the flowers are a double deep gold. Spreads but slowly.

L
Ithaca, NY (Zone 5b) | January 2005 | positive

Clump forming, fast growing with lance-shaped to ovate, slightly hairy, dark green leaves that can get up to 8" long. Flowerheads are dou...Read More

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