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

Category:

Perennials

Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Unknown - Tell us

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Unknown - Tell us

Height:

24-36 in. (60-90 cm)

36-48 in. (90-120 cm)

Spacing:

15-18 in. (38-45 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)

Sun Exposure:

Full Sun

Danger:

Unknown - Tell us

Bloom Color:

Bright Yellow

Bloom Time:

Late Summer/Early Fall

Mid Fall

Foliage:

Herbaceous

Other details:

Unknown - Tell us

Soil pH requirements:

6.6 to 7.5 (neutral)

7.6 to 7.8 (mildly alkaline)

7.9 to 8.5 (alkaline)

Patent Information:

Non-patented

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 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

show all

Gardeners' Notes:

2
positives
0
neutrals
0
negatives
RatingContent
Positive

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

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.