Helianthus annuus Russian Mammoth (Common Sunflower)

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.

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.

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 Helianthus – Sunflowers
Exposure Full Sun
Season of Interest Summer (Mid,Late)
Height 9'
– 12'
(270cm
– 3.6m)
Spread 2'
– 4'
(60cm
– 120cm)
Spacing 48″ (120cm)
Water Needs Average
Maintenance Low
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