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Helianthus annuus ‘Russian Mammoth’ (Common Sunflower)

Common Sunflower 'Russian Mammoth', Comb Flower 'Russian Mammoth', Golden Flower of Peru 'Russian Mammoth', St Bartholomew's Star 'Russian Mammoth'

Helianthus annuus Russian Mammoth, Common Sunflower Russian Mammoth, Comb FlowerRussian Mammoth, Yellow Flowers, Yellow Annuals

A giant variety, Helianthus annuus ‘Russian Mammoth’ (Common Sunflower) is a tall annual boasting huge flowers, up to 8-14 in. across (20-35 cm), with brilliant golden-yellow petals surrounding a dark chocolate central disk. Borne atop sturdy stalks, the impressive flower heads are attractive to bees, butterflies and birds and make a real statement in the landscape. Easy to grow and sensational at the back of a sunny border. Gardeners also harvest and roast the plump seeds.

  • Typically grows up to 9-12 ft. tall (270-360 cm) and 24-48 in. wide (60-120 cm). May need support
  • Prefers full sun and enjoys moderately fertile, humus-rich, moist, neutral to alkaline, well-drained soils. Site in a sheltered location, as the wind may catch the heavy heads.
  • Low maintenance, this is an excellent choice for the back of perennial borders where the dazzling flowers are welcomed in any color scheme. Perfectly suited to the cutting garden, or cottage gardens.
  • Attractive to bird, butterflies and bees, it is deer resistant.

Learn How To Plant, Care and Grow Gorgeous Sunflowers


Cherished for their beauty, Sunflowers (Helianthus) are striking ornamental annuals or perennial plants grown for their colorful summer and fall blooms. Fast-growing, they can reward you with glamorous blooms between 55 and 100 days after planting. Here are some basic rules that need to be followed to enjoy their splendid flowers.

Requirements

Hardiness 2 - 11
Heat Zones 1 - 12
Climate Zones 1, 1A, 1B, 2, 2A, 2B, 3, 3A, 3B, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24
Plant Type Annuals
Plant Family Compositae
Genus Helianthus
Common names Common Sunflower, Sunflower
Exposure Full Sun
Season of Interest Summer (Mid, Late)
Height 9' - 12'
(270cm - 3.7m)
Spread 2' - 4'
(60cm - 120cm)
Spacing 48" (120cm)
Maintenance Low
Water Needs Average
Soil Type Chalk, Clay, Loam, Sand
Soil pH Alkaline, Neutral
Soil Drainage Moist but Well-Drained
Characteristics Cut Flowers, Showy
Tolerance Deer
Attracts Bees, Birds, Butterflies
Garden Uses Beds And Borders, Wall-Side Borders
Garden Styles Cutting Garden, Informal and Cottage, Prairie and Meadow
How Many Plants
Do I Need?
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Helianthus (Sunflower)
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Alternative Plants to Consider

Helianthus decapetalus (Ten-Petaled Sunflower)
Helianthus pauciflorus (Stiff Sunflower)
Helianthus nuttallii (Nuttall’s Sunflower)
Helianthus angustifolius (Swamp Sunflower)
Helianthus debilis (Beach Sunflower)
Helianthus divaricatus (Woodland Sunflower)

Recommended Companion Plants

Pennisetum orientale (Oriental Fountain Grass)
Anthemis tinctoria ‘E.C. Buxton’ (Golden Marguerite)
Eryngium planum ‘Blue Glitter’ (Flat Sea Holly)
Allium sphaerocephalon (Drumstick Allium)

Find In One of Our Guides or Gardens

Companion Planting With Annuals
Best Annual Flowers For Your Vegetable Garden
Best Annual Flowers and Plants for Full Sun
Learn How To Plant, Care and Grow Gorgeous Sunflowers
Main Sunflower Types for your Garden
While every effort has been made to describe these plants accurately, please keep in mind that height, bloom time, and color may differ in various climates. The description of these plants has been written based on numerous outside resources.
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Requirements

Hardiness 2 - 11
Heat Zones 1 - 12
Climate Zones 1, 1A, 1B, 2, 2A, 2B, 3, 3A, 3B, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24
Plant Type Annuals
Plant Family Compositae
Genus Helianthus
Common names Common Sunflower, Sunflower
Exposure Full Sun
Season of Interest Summer (Mid, Late)
Height 9' - 12'
(270cm - 3.7m)
Spread 2' - 4'
(60cm - 120cm)
Spacing 48" (120cm)
Maintenance Low
Water Needs Average
Soil Type Chalk, Clay, Loam, Sand
Soil pH Alkaline, Neutral
Soil Drainage Moist but Well-Drained
Characteristics Cut Flowers, Showy
Tolerance Deer
Attracts Bees, Birds, Butterflies
Garden Uses Beds And Borders, Wall-Side Borders
Garden Styles Cutting Garden, Informal and Cottage, Prairie and Meadow
How Many Plants
Do I Need?
Explore Great Plant Combination Ideas
Helianthus (Sunflower)
Not sure which Helianthus (Sunflower) to pick?
Compare Now

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