Silverleaf Sunflower
Helianthus argophyllus

Family: Asteraceae (ass-ter-AY-see-ee) (Info)
Genus: Helianthus (hee-lee-AN-thus) (Info)
Species: argophyllus (ar-go-FIL-us) (Info)

Category:

Annuals

Height:

4-6 ft. (1.2-1.8 m)

Spacing:

15-18 in. (38-45 cm)

18-24 in. (45-60 cm)

Hardiness:

Not Applicable

Sun Exposure:

Full Sun

Danger:

N/A

Bloom Color:

Gold (Yellow-Orange)

Bloom Time:

Mid Summer

Late Summer/Early Fall

Mid Fall

Foliage:

Silver/Gray

Velvet/Fuzzy-Textured

Other details:

Average Water Needs; Water regularly; do not overwater

Soil pH requirements:

6.1 to 6.5 (mildly acidic)

6.6 to 7.5 (neutral)

7.6 to 7.8 (mildly alkaline)

Patent Information:

Non-patented

Propagation Methods:

Unknown - Tell us

Seed Collecting:

Allow seedheads to dry on plants; remove and collect seeds

Properly cleaned, seed can be successfully stored

Regional

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

Grand Isle, Louisiana

Freeport, Texas

Houston, Texas

Matagorda, Texas

Sweeny, Texas

Gardeners' Notes:

2
positives
0
neutrals
0
negatives
RatingContent
Positive

On Jun 12, 2015, Fires_in_motion from Vacherie, LA (Zone 9a) wrote:

This site's maximum height (6 feet) needs to be increased, because I saw some on the dunes of Grand Isle, LA today that were about 9 feet tall. The tall ones were multi-trunked, radiating outward like spokes from a center point. If they can grow that huge in pure sand, I can only imagine how much bigger they can get in actual nutrient-rich soil... Also saw several young (single-trunked) plants only a few feet tall that were already blooming. I stupidly failed to collect any seeds, so I'll have to drive 100 miles down there to get some.

Positive

On Nov 11, 2008, btc129psu from Houston, TX (Zone 9a) wrote:

This sunflower has proven to be a very hardy addition to my garden. I had planted a few seeds in a 4" black seedling pot late in the season and before I had a chance to plant them in the ground or a bigger pot I had to travel abroad from about May to early August. They sat in the tiny black pot for over 3 months throughout the peak of summer with virtualy no care. Although they were long, stringy and stunted looking when I returned in early fall, I potted them in a large pot and they began to thrive. It is now the second week of November and despite a hurricane and cooling temperatures they have just begun to flower prolifically. Their foliage has been quite attractive as they grew and now their flowers are an eye catching addition to my garden at this transitory period between growin... read more