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Sunflower American Giant F1 - Seeds



Catalogue Code: 30210446

RHS Award of Garden Merit
Sale price

In stock

Regular price £3.49
Giant by name and giant by nature! Sunflower ‘American Giant’ really is huge, growing up to 5m (16ft) tall, with a strong sturdy stem that needs no support.

Key Features

  • F1 Hybrid variety
  • Prefers full sun

Pack Contents: 12 Sunflower Seeds

Height: 500cm

Flower Colour: Yellow


  • Huge sunflower reaching up to 5m (16ft) tall
  • Sturdy stems need no support
  • Fun for kids to grow
  • RHS Award of Garden Merit

Giant by name and giant by nature! Sunflower ‘American Giant’ really is huge, growing up to 5m (16ft) tall, with a strong sturdy stem that needs no support. This quick-growing sunflower is fun for kids to grow and perfect for winning competitions! A holder of the prestigious RHS Award of Garden Merit, it’s also pollinator-friendly and great for wildlife gardens.

Sow indoors

Fill a small 6cm (2½ in) pot with span style=""text-decoration: underline;"">seed compost, shake and level firm with the base of another pot. Water well with a fine rose. Sow seeds individually into compost, pushing seeds to 1cm (½ in) deep. Place in a propagator at 15-20°C (60-70°F) or cover pot with cling film and leave in a warm room. When shoots appear, remove cling film. Keep seedlings in a light position, but shade from direct sunlight. Grow on in a minimum temperature of 10°C (50°F)

Sow outdoors

Sow seeds in pre-watered soil at a depth of 2cm (1in) in their flowering positions. Keep soil moist until seedlings are established. Thin out to 30cm (12in) apart.

Plant out

Gradually accustom plants to outside conditions for 2-3 weeks before planting out when risk of frost has passed. Water well until established.

Special Note: Do not remove spent sunflower heads. They provide attractive autumn seed heads which are great for providing wild birds with a treat.


Sunflower seeds are not only for wild birds. Cut and hang the mature sunflower seed head upside down in a warm, well ventilated room. Once dry push the seeds out of the head and store in a dry cloth bag. Eat as required.

Growing Calendar

J Jan F Feb M Mar A Apr M May J June J Jul A Aug S Sep O Oct N Nov D Dec
Sow Indoors
Sow Outdoors

How to Guide

Row Spacing



We know how important your garden is to you. We've listened to our customers and introduced a new improved speedy delivery service, meaning Express delivery comes as standard.

*Orders to Northern Ireland have an automatic additional £3.00 delivery surcharge applied at checkout. 

Order TypeDelivery ChargeDelivery Charge
Seed only order£2.49If you purchase any other items you'll be charged the standard delivery rate of £5.99
Plants, bulbs & gardening accessories£5.99If we need to split your order into separate deliveries we'll only charge one delivery fee
Extra large or long plants & heavy items£9.99These are clearly displayed at check-out
Compost (and any other large or heavy items)£5.99

These items are subject to a delivery multiplier where orders containing 3 or 4 items will be subject to an additional £5.99 for every further 2 items added. This is automatically applied at check-out:

  • 1 - 2 bags £5.99
  • 3 - 4 bags £11.98
  • 5 - 6 bags £17.97
  • 7 - 8 bags £23.96
  • 9 - 10 bags £29.95

If you'd like more than 10 bags of compost please call our Customer Service team who can arrange for a bespoke competitive quote on 01480 774555 (standard network charges apply)

For more detail on specific delivery queries and compost delivery please click here

Delivery to outside of Great Britain

We regret we are unable to deliver any items outside of some Great Britain delivery addresses. This includes Europe, Channel Islands, Republic of Ireland, USA and Rest of World. We will update our website if this changes. 

We now deliver to Northern Ireland, additional delivery surcharges automatically apply at checkout. 

For more information about our deliveries please click here.