Photo by Melody

PlantFiles: Thin-leaved Sunflower
Helianthus x multiflorus 'Flore-Pleno'

Family: Asteraceae (ass-ter-AY-see-ee) (Info)
Genus: Helianthus (hee-lee-AN-thus) (Info)
Species: x multiflorus
Cultivar: Flore-Pleno

One vendor has this plant for sale.

4 members have or want this plant for trade.


24-36 in. (60-90 cm)
36-48 in. (90-120 cm)

15-18 in. (38-45 cm)

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)

Sun Exposure:
Full Sun

Unknown - Tell us

Bloom Color:
Bright Yellow

Bloom Time:
Late Summer/Early Fall
Mid Fall


Other details:
Average Water Needs; Water regularly; do not overwater

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

Click thumbnail
to view:

By GardenGuyKin
Thumbnail #1 of Helianthus x multiflorus by GardenGuyKin

By poisondartfrog
Thumbnail #2 of Helianthus x multiflorus by poisondartfrog


2 positives
No neutrals
No negatives

Gardeners' Notes:

Positive ellen505 On Sep 19, 2007, ellen505 from Merion Station, PA wrote:

I planted three 4-inch tall seedlings this spring. Today they are 5 feet tall nonstop flowering machines. The leaves are deep green and healthy, and it flowers throughout the plant (not just at the top.) Great cut flowers too. A+++ (zone 6)

Positive lmelling On Jan 18, 2005, lmelling from Ithaca, NY (Zone 5b) wrote:

Clump forming, fast growing with lance-shaped to ovate, slightly hairy, dark green leaves that can get up to 8" long. Flowerheads are double, bright yellow and bloom from midsummer to early autumn. Can get up to 5' tall.


This plant has been said to grow in the following regions:

Juneau, Alaska
Calistoga, California
Loganville, Georgia
Barbourville, Kentucky
Tuckerton, New Jersey
New Carlisle, Ohio
Salem, Oregon
Merion Station, Pennsylvania
Wilkes Barre, Pennsylvania
Linden, Texas
Buckhannon, West Virginia

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