Thompson & Morgan Sunflower Helianthus Annuus Russian Giant - Yellow
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This guide is designed for gardeners of all levels who want to cultivate the impressive Thompson & Morgan Sunflower 'Russian Giant'. These sunflowers are ideal for those who enjoy gardening competitions and attracting wildlife. Note that these plants require full sun and can grow up to 8-10 feet tall, so be sure you have adequate space.
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| Model Part Number | KC9705 |
|---|---|
| Brand | Thompson & Morgan |
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FAQs
How much sunlight do these sunflowers need?
They need at least 6-8 hours of direct sunlight per day.
When should I plant the seeds?
Plant seeds directly into the ground after the last frost, or start indoors a few weeks before.
How often should I water the sunflowers?
Keep the soil consistently moist but not waterlogged, especially during dry periods.
Do I need to fertilize these sunflowers?
Yes, apply a balanced fertilizer every 4-6 weeks to support their growth.
How tall do these sunflowers grow?
They can reach heights of 8-10 feet (2.4-3 meters).
How big do the flower heads get?
The flower heads can grow up to 30cm (12 inches) in diameter.
Can I grow these in a container?
While possible, they may not reach their full potential in a container. Choose a very large pot.
Are these sunflowers good for attracting wildlife?
Yes, they attract bees with their nectar and birds with their seeds.
Troubleshooting
Seeds not germinating.
Ensure the soil temperature is warm enough (at least 70°F or 21°C). Water the soil consistently, but avoid overwatering.
Stunted growth.
Check the soil's fertility and amend with fertilizer. Ensure the plant is receiving adequate sunlight.
Yellowing leaves.
This could be due to overwatering or a nutrient deficiency. Adjust your watering schedule and/or fertilize.
Plant falling over.
Provide support with stakes, especially in windy conditions. Consider planting in a sheltered area.
Pests on leaves.
Inspect the plants regularly for pests. Use insecticidal soap or other appropriate treatments as needed.
Pros and Cons
Pros
- Produces enormous, visually striking flowers.
- Attracts beneficial insects and provides food for birds.
- Offers a quick-growing solution for screening or adding height to your garden.
- Suitable for various garden settings, including vegetable plots and decorative spaces.
- Relatively easy to grow, even for beginners.
Cons
- Requires significant space due to its height and spread.
- Needs full sun exposure for optimal growth, limiting placement options.
- May require staking or support in windy conditions.
- Susceptible to certain pests and diseases if not properly cared for.
- Results may vary depending on growing conditions.
Setup, Compatibility & Care
Setup:
- Choose a Sunny Spot: Select a location that receives full sun (at least 6-8 hours of sunlight per day).
- Prepare the Soil: Ensure the soil is well-draining. Amend with compost or other organic matter.
- Sow Seeds: Plant seeds directly into the ground after the last frost, or start indoors for an earlier start.
Compatibility:
- Sunlight: Thrives in full sun.
- Temperature: Prefers warm conditions; avoid frost.
- Watering: Keep soil consistently moist but not waterlogged.
- Feeding: Apply a balanced fertilizer every 4-6 weeks.
- Humidity: Prefers moderate humidity levels.
Care:
- Watering: Water regularly, especially during dry periods.
- Fertilizing: Feed with a balanced fertilizer every 4-6 weeks.
- Weeding: Keep the area around the plants weed-free.
- Support: Provide support if necessary, especially in windy areas.
- Pest Control: Monitor for pests and diseases, and take appropriate action if needed.