Russian Mammoth Organic

SKU: FL3228
Russian Mammoth Organic sunflower seeds are CERTIFIED ORGANIC! Russian Mammoth heirloom sunflowers mature a little later in summer, but grow to an impressive 3m (10') tall, with heavy heads that average 50cm (20") in diameter. Read More

Exposure Full-sun

Average Seeds Per Gram 12 ?

Russian Mammoth Organic has a rating of 4.7 stars based on 3 reviews.
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Heirloom Attracts Pollinators Organic Canada Organic Certified USDA Organic Certified
Shipping & Returns

West Coast Seeds ships anywhere in North America. However, we are not able to ship garlic, potatoes, asparagus crowns, bulbs, onion sets, Mason bee cocoons, or nematodes outside of Canada. We regret, we cannot accept returns or damages for orders outside of Canada. The minimum shipping charge to the US is $9.99.

Seeds of Growth

For every order online, we donate a pack of seeds to gardens and communities worldwide through our Seeds of Growth program, supporting sustainable growth and local food systems.

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Russian Mammoth Organic

Product Details

Russian Mammoth heirloom sunflowers mature a little later in summer but grow to an impressive 3.5m (12') tall, with heavy heads that can grow to 50cm (20") in diameter! Plants benefit from staking as the heads get BIG. The seeds are large, tasty and edible; dry roast them in the oven and add optional sea salt. You will know the seeds are mature when chickadees start clinging to the downward pointing faces of the enormous flower heads. This is a fun plant to grow with young people as it becomes truly massive in just a couple of months.

Annual.

Quick Facts:

    • Edible seeds
    • Food for birds and bees
    • Plants grow to 3.5m (12') tall
    • Benefits from staking
    • Mature later in summer

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All About Russian Mammoth Organic

Latin

Latin
Helianthus annuus
Family: Asteraceae

Difficulty

Difficulty
Easy

Season & Zone

Season & Zone
Exposure: Full sun

Timing

Timing
Direct sow repeatedly after the last frost date. Starting indoors is possible, but does not gain much time. If sunflowers are allowed to get root-bound, they will lack stability at transplant time, and will require staking. Optimal soil temperature for germination: 21-30°C (70-85°F). Seeds should sprout in 10-14 days.

Starting

Starting
Sow seeds 5mm-1cm  (¼-½”) deep. Space dwarf varieties 15cm (6″) apart, but give the giants lots of room at 1m (3′) between plants.

Growing

Growing
To grow really big plants with really big flowers, enrich the soil with organic matter and incorporate 2 cups of balanced organic fertilizer per 3m (10′) of row, and irrigate regularly. When the plants are 30cm (12) tall, dissolve 5ml (1 tsp) of borax (for boron) in 350 ml (12 fl oz) of water and spread the solution over 5m (15′) of row. Be careful not to over-apply this solution. This application of boron will produce bigger seeds and flower heads. Do not apply boron to other garden plants. When the back of the flower head turns yellow, it is ready to be cut from the plant.

Companion Planting

Companion Planting
Sunflowers planted near rows of corn are said to increase yields. Sunflowers can be used to draw heavy metals, toxins, and even radiation from soil, but should be burned at the end of the season if grown for this purpose. Plant sunflowers amid squash plantings to improve pollination and overall production.

More on Companion Planting.

How to Grow Sunflowers

Step 1

Timing

Direct sow repeatedly after the last frost date. Starting indoors is possible, but does not gain much time. If sunflowers are allowed to get root-bound, they will lack stability at transplant time, and will require staking. Optimal soil temperature for germination: 21-30°C (70-85°F). Seeds should sprout in 10-14 days.

Step 2

Starting

Sow seeds 5mm-1cm  (¼-½”) deep. Space dwarf varieties 15cm (6″) apart, but give the giants lots of room at 1m (3′) between plants.

Step 3

Growing

To grow really big plants with really big flowers, enrich the soil with organic matter and incorporate 2 cups of balanced organic fertilizer per 3m (10′) of row, and irrigate regularly. When the plants are 30cm (12) tall, dissolve 5ml (1 tsp) of borax (for boron) in 350 ml (12 fl oz) of water and spread the solution over 5m (15′) of row. Be careful not to over-apply this solution. This application of boron will produce bigger seeds and flower heads. Do not apply boron to other garden plants. When the back of the flower head turns yellow, it is ready to be cut from the plant.

Tips

Companion Planting

Sunflowers planted near rows of corn are said to increase yields. Sunflowers can be used to draw heavy metals, toxins, and even radiation from soil, but should be burned at the end of the season if grown for this purpose. Plant sunflowers amid squash plantings to improve pollination and overall production.

Customer Reviews & Questions