- Sow directly outdoors between March and May, 12mm deep.
- Alternatively, sow seeds indoors in individual pots.
- This allows for faster germination and earlier flowering.
- Maintain a temperature of 20–23c. Seeds typically germinate in 14-21 days.
- Gradually acclimatise the seedlings to outdoor conditions before planting out, after the risk of frost has passed.
- Protect young seedlings from slugs and snails, especially during early growth.
- Provide support if needed, staking the stems to keep plants upright.
Sunflower ‘Mongolian Giant’ reaches up to 14 ft, producing massive yellow blooms with one of the largest seed heads. Ideal for adding vertical interest, the seeds can also be left to feed birds and wildlife.
