United States Edition

Sunflower 'Mammoth'     

Helianthus annuus

'Mammoth' is a Sunflower variety in the Helianthus genus with a scientific name of Helianthus annuus. 'Mammoth' is considered a heirloom cultivar. Blooms appear in these approximate colours:   Golden yellow and   Selective yellow. The mature flowers are of a Single form. Leaves appear approximately as a   Dark olive green and   Dark spring green colour.

This variety attains a height of 8 to 10 feet. Is fast growing and produces a giant bloom. The seed make good bird feeding in the winter.[seed packet Bentley Seeds, Inc.]

To save seeds, cut the stem beneath flower heads when the backs of the flower heads turn yellow. Hang it in a cool and dry place and let it dry. It will take about a month for it to dry. In order to keep seeds from falling on the ground, a net should be used to cover the flower.

It is an Flower and is treated mainly as a Annual, This means that it grows best over the course of a single year. Mammoth is known for its Erect habit and growing to a height of approximately 1.50 metres (4.88 feet).

Mammoth Sunflower is normally quite a low maintenance plant and is normally very easy to grow - great for beginner gardeners!

This plant info is provided by the myfolia gardener's wiki. All details about Sunflower 'Mammoth' have been kindly provided by our members.

How to grow Sunflower 'Mammoth'

  • Full Sun

  • Medium

Position in a full sun location and remember to water moderately. Keep in mind when planting that Mammoth is thought of as half hardy, so remember to protect this plant from frosts and low temperatures. Use USDA Hardiness Zone 4 - 9 as your guideline for the appropriate climate for this plant. Ideally plant in loamy and clay soil and try to keep the ph of your soil between the range of 5.7 and 8.1 as Mammoth likes to be in weakly acidic soil to weakly alkaline soil.

Growing Mammoth from seed

Try to aim for a seed spacing of at least 4.68 inches (12.0 cm) and sow at a depth of around 0.49 inches (1.25 cm). Soil temperature should be kept higher than 13°C / 55°F to ensure good germination.

By our calculations, you should look at sowing Mammoth about 21 days before your last frost date.

Transplanting Mammoth

Ensure that temperatures are mild and all chance of frost has passed before planting out, as Mammoth is a half hardy plant.

Harvesting Mammoth

Sunflower 'Mammoth' information

How long does Mammoth take to grow?

These estimates for how long Sunflower 'Mammoth' takes to sprout, grow and harvest are from real observations from real gardeners, right around the world. Start logging and journaling your observations to participate!

When should I sow Mammoth?

Folia's when to plant Sunflower 'Mammoth' estimates are relative to your last frost date. Enter your frost dates and we'll calculate your sowing and planting dates for you!

Sunflower Mammoth Etymology

The botanical epithet is from the Latin annuus meaning “annual”.1

Mammoth folklore & trivia

First offered by seed companies in the 1800’s.

Other Names for Sunflower 'Mammoth'


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