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mammoth seeds

Mammoth Russian Sunflower Seeds 6140. If you want to grow the champion sunflower for the fall fair, this heirloom variety is the one to choose! Huge, single yellow blooms ranging from 25-35 cm (10-14″) in diameter are produced on tree trunk like stems that can easily grow to 3 m (9′) or more in height! This is the best variety for feeding the birds as well as for roasting seed for yourself! Taller plants may need staking due to the weight of their mighty seed heads! This product is part of the Urban Garden Collection; click here to check it out.

9-10 seed/gram. Easy to grow. In late May, choose a sunny site with well draining soil and sow seed about 6-12 mm (1/4-1/2″) deep and 7.5-10 cm (3-4″) apart. Thin or transplant seedlings to 30-45 cm (12-18″) apart. Seed can be started 2-3 weeks early indoors using plantable peat pots or Jiffy 7’s at 21 C (70 F). Harden off seedlings then transplant to a site in full sun. Keep plants evenly watered and fertilize twice during the season with a granular 15-5-15 or equivalent.

How to Grow

Mammoth seeds

5 out of 5 stars Jul 23, 2018

Harvesting: Seeds are ready to harvest when the back of the head has dried and turned brown, about 4 weeks after the flowers have been pollinated. Petals will have wilted and fallen off, and the seeds will be plump, and colored white with gray/black stripes. Seeds ripen around the outside of the flower first; the ones in the center will ripen last. Average yield is approximately 1 pound per head.

Variety Information: Up to 12″-wide flowers with yellow petals and a brown center. Single type.

Seed Spacing: A group of 3 seeds every 24″

Felt like Alice in Wonderland

When to Start Inside: 2 to 4 weeks before your average last frost date. Sunflowers are senstive to root disturbance; sow in biodegradable pots that can be planted directly in the ground.

Attributes: Attracts Pollinators, Cut Flower, Drought Tolerant, Heat Tolerant

Days to Emerge: 10–15 days


Exposure: Full sun

5 out of 5 stars Aug 11, 2020

Mammoth seeds

Growing plants from seed is a great way to start gardening earlier in the season. With the right light and some simple equipment, it’s easy to grow from seed to harvest.


W. Robinson & Son (Seeds & Plants) Ltd Sunny Bank, Forton PR3 0BN

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