Sunflower 'Mongolian Giant'Helianthus annuus

Hardy Annual

What is Hardy Annual?
A plant that completes its entire life cycle (growth, reproduction, death) in one season.
Capable of withstanding outdoor winter temperatures down to -15C.

Fulfilled and sold by Thompson & Morgan

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Height Up to 420cm (165.4in)
Spread Up to 60cm (23.6in)

Hardy Annual

cottage gardenswildlife gardensspecimen plant

Full sun

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Sowing Months Flowering Months

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Description

Fun to grow, producing flower heads up to 45cm (18in) across with individual seeds up to 3½cm (1½in) 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


1 packet (10 sunflower seeds) (TM08295)

Sowing
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.

More Info

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

Delivery

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 or potting on. Delivery times will be stated on the product page above, or in your order acknowledgement page and email.

Orders for packets of seed incur a delivery charge of £2.99.

Orders which include any other products will incur a delivery charge of £4.99.

Where an order includes both packets of seeds and other products, a maximum delivery charge of £6.99 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 more information on different charges that may apply to certain destinations.

For more information on how we send your plants please visit our Helpful Guide on plant sizes.

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