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Sunflower 'Mongolian Giant'Helianthus annuus

Just £2.39

4 Reviews
Description Sowing More Info Delivery Reviews

Fun to grow, producing flower heads up to 45cm (18in) across with individual seeds up to 3 1/2cm (1 1/2in) long. As well as producing large yellow flower heads, Sunflower Mongolian Giant will be the envy of your neighbours as it grows up to 420cm (14ft) tall.

Culinary note: Some parts of these flowers are edible. Try toasting the seed kernels for a healthy snack. For more details about edible flowers click here.

Companion planting: Try growing sunflowers with chives to deter aphids.

Useful links:

Companion Planting

Cottage Gardens, Wildlife Gardens, Specimen Plant


Full sun

420cm (165.4in)

60cm (23.6in)

Sowing Months Flowering Months

It is wise to provide these tall stems with some added support as they grow.

Sow seeds March to May. Sow seeds thinly, 12mm (1/2") deep in drills 45cm (18in) apart in well cultivated soil raked to a fine tilth or direct into small containers. Germination takes around 21 days. For earlier flowering: Sow indoors, individually in 7.5cm (3in) pots at 20-25C (68-77F). When well grown, gradually acclimatise to outdoor conditions before planting out after all risk of frost has passed.

When large enough to handle, thin to 45cm (18in) apart.


Seeds and garden supplies will normally be delivered within the time period stated against each product as detailed above. Plants, bulbs, corms, tubers, shrubs, trees, potatoes etc are delivered at the appropriate time for planting and will be stated on the product page or in your order acknowledgement page and email.

Orders for packets of seed incur a delivery charge of £1.95.

Orders which include any other products will incur a delivery charge of £4.95.

Where an order includes both packets of seeds and other products, a maximum delivery charge of £6.90 will apply - regardless of the number of items ordered.

Large items may incur a higher delivery charge - this will be displayed in your shopping basket.

Please see our Delivery page for further details and details of any surcharges that may apply to certain destinations.

Satisfaction Guaranteed

For your complete peace of mind, our Home and Garden products may be returned to us within 30 days of purchase for a refund of the purchase price. Items must be returned unused, at your cost and in mint condition. All items carry a manufacturer's 12 month defects warranty.


So so. 2016-08-31

Ten seeds and only 2 plants grew. 100's of seeds harvested but they all turned hollow so are not viable for planting again. What's the point of sunflower's if you can't harvest and replant?! Achieved only 8ft and 6 ft from the 2 plants that did grow.

T&M replied on 2016-09-01: Thank you for your review. I am sorry to learn of your disappointment with your purchase. At your earliest convenience please contact our Customer Care Department at, one of our agents will be more than happy to look into this further for you.

Update 2012-08-23

Despite the awful weather this year all the seeds germinated but they are not as tall as last year only eight feet and the flower heads not as large.Even so they are imposing flowers and the bees love them!

Flowers not as large 2011-08-22

Full germination and plants were a variety of heights ,the shortest being 3 meters the tallest almost 6 meters I used a nearby conifer as a post to tie the stem to. A great source of interest to my neighbours young lad. I have already bought the seeds for next year. I will try for larger flowers next year .

Mongolian Giant - germination 2010-10-22

I grew these seeds this year and had no difficulty with germination.