Flowers
Helianthus 'Yellow Giant' (Sunflower)
Sunflowers
Tall annual with striking yellow flowers. If you want tall sunflowers with giant heads, this is the plant to grow! Flowers can reach diameter of up to 30cm. If not planning to harvest the seeds, leave the spent flowers on the plant so that birds can feed on the exposed seed head in autumn.
- Plant type
- Hardy Annual
- Position
- Full sun
- Height
- 3m
- Spread
- 50cm
Growing calendar
JFMAMJJASOND
Sow indoors
Sow outdoors
Flowering
Sowing & growing
Best sown Apr-May where they are to flower. Sow 15mm deep, 40-50cm apart in fine soil which has be raked to a fine tilth. Can be started early under glass from Mar-Apr. Sow 15mm deep in individual pots of seed compost and keep moist. Place in greenhouse or cold frame to germinate, planting out when risk of frost has passed.
Aftercare
Stems will need staking. When established, water deeply but infrequently.
Gallery
Ref. SES042