Helianthus, Annual Sunflower, Common Sunflower 'Mammoth Russian'

Helianthus annuus

Family: Asteraceae (ass-ter-AY-see-ee) (Info)
Genus: Helianthus (hee-lee-AN-thus) (Info)
Species: annuus (AN-yoo-us) (Info)
Cultivar: Mammoth Russian
Additional cultivar information:(aka Mammoth, Russian Mammoth, Black Russian)



Water Requirements:

Unknown - Tell us

Sun Exposure:

Full Sun





Foliage Color:



12-15 ft. (3.6-4.7 m)


24-36 in. (60-90 cm)


Not Applicable

Where to Grow:

Unknown - Tell us



Bloom Color:

Bright Yellow

Bloom Characteristics:

Unknown - Tell us

Bloom Size:

Unknown - Tell us

Bloom Time:

Mid Summer

Other details:

Unknown - Tell us

Soil pH requirements:

5.6 to 6.0 (acidic)

6.1 to 6.5 (mildly acidic)

6.6 to 7.5 (neutral)

7.6 to 7.8 (mildly alkaline)

Patent Information:

Unknown - Tell us

Propagation Methods:

From seed; direct sow after last frost

Seed Collecting:

Collect seedhead/pod when flowers fade; allow to dry


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

College, Alaska

Phoenix, Arizona

Batesville, Arkansas

Blytheville, Arkansas

Los Angeles, California

Morgan Hill, California

Sacramento, California

San Diego, California

Aurora, Colorado

Denver, Colorado

Longmont, Colorado

Jacksonville, Florida

Naples, Florida

Augusta, Georgia

Carrollton, Georgia

Lilburn, Georgia

Roopville, Georgia

Chillicothe, Illinois

Elmhurst, Illinois

Elk Horn, Iowa

Shawnee Mission, Kansas

Wichita, Kansas

Bethelridge, Kentucky

Lewisburg, Kentucky

Battle Creek, Michigan

Macomb, Michigan

Natchez, Mississippi

Hallsville, Missouri

Las Vegas, Nevada

Silver Springs, Nevada

Greenville, New Hampshire

Piscataway, New Jersey

Roswell, New Mexico

Campbell Hall, New York

Staten Island, New York

Raleigh, North Carolina

Columbia Station, Ohio

Niles, Ohio

Hulbert, Oklahoma

Bend, Oregon

Wilsonville, Oregon

Allentown, Pennsylvania

Kingston, Pennsylvania

Coventry, Rhode Island

North Augusta, South Carolina

Brazoria, Texas

Edinburg, Texas

Fort Worth, Texas(2 reports)

Pearland, Texas

Round Rock, Texas

San Antonio, Texas

Farmington, Utah

Magna, Utah

show all

Gardeners' Notes:


On Jul 12, 2014, YosemiteJunkie from Carrollton, GA (Zone 7b) wrote:

These were grown in Hard Clay in zone 7B and I don't know if the seeds were a bad batch or not. I got them at Walmart. But all the flowers turned out deformed with weird shapes and quickly bowed their heads to the ground once bloomed.


On May 13, 2014, Lovehum wrote:

American goldfinches and even some red cardinals ate the seeds in autumn and winter. Unfortunately they'll attract aggressive house sparrows too.


On Oct 14, 2013, jjstatz29 from Elk Horn, IA (Zone 5b) wrote:

Positive: huge easy to grow impressive plant that will have your neighbors concerned and/or extremely interested

Negative: topples easily and those stems are ... challenging to deal with (get out the machete... or better yet the chainsaw)

Positive: Huge amount of seed from one plant for eating, gifting, and planting next year

Negative: insignificant petals (relative to size) that are extremely short lived.


On Sep 3, 2012, Dosetaker from Mason, NH (Zone 5b) wrote:

Planted ours a bit late and as such they did not grow to the common monster proportions they are known for...but they still gave us very beautiful flowers on stalks that reached about the five foot mark.


On Aug 20, 2011, CCPikie from Elmhurst, IL wrote:

These grew well in my poor soil. Should have followed advice to plant in stages to assure longer bloom. My only complaint is the short life of the flower. It's perfect for only a few days, then bows and faces the ground. Bought seed from Ferry-Morse.


On Nov 3, 2008, CurtisJones from Broomfield, CO (Zone 5b) wrote:

From your friends at Botanical Interests: Towering in the garden at 6'-10' tall, these Mammoth (also called Mammoth Russian) sunflowers often have seed heads that are up to 1' across! This popular heirloom variety has been grown in gardens since the late 1800's. You can grow them for use as cut flowers - (one flower would fill a vase), as a fun fast-growing variety for a kid's garden, to eat the abundant sunflower seeds, or to provide winter fare for birds. (Note: Start from seed indoors 4-6 weeks before transplanting outside if you have trouble with birds or other critters eating your seeds or young seedlings outdoors.)


On Jun 25, 2008, atrotasha from New Port Richey, FL (Zone 9b) wrote:

These are great, you just have to watch them when they are small because the animals like them. Last year mine got eaten one night. It was there when i went to bed and the next day it was gone and the stalk had chew marks all over it. When that does'nt happen, growing sunflowers is very rewarding.


On Sep 19, 2004, blondemommyof2 from Lititz, PA (Zone 6a) wrote:

Great sunflower kids love it and it attracts lots of birds!~