Thompson & Morgan Sunflower Giant Yellow - 50 Seeds
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This guide is for gardeners looking to add a vibrant, large-scale floral display to their outdoor spaces with minimal effort. The Thompson & Morgan Sunflower Giant Yellow offers an impressive burst of cheerful color and towering height, perfect for creating a stunning visual impact. A potential caveat is their significant height, requiring ample space to grow and display effectively.
All features
| Model Part Number | 133069 |
|---|---|
| Brand | Thompson & Morgan |
Extended Product Information
FAQs
How tall do these sunflowers get?
Thompson & Morgan Sunflower Giant Yellow typically grows to a height ranging from 1.8 to 2.7 meters (approximately 6 to 9 feet).
When is the best time to sow the seeds?
It is best to sow these seeds directly outdoors after the last frost has passed in your area, typically in late spring.
Do I need to stake these sunflowers?
Yes, due to their significant height, staking is often recommended to support the plants and prevent them from falling over, especially in windy conditions.
What kind of soil do they prefer?
They prefer fertile, well-drained soil. Adding compost before planting can improve soil quality and performance.
How much sun do they need?
Sunflowers require full sun, meaning they need at least 6 to 8 hours of direct sunlight per day to grow and flower best.
Can I grow these in pots?
While possible, their large size makes them best suited for in-ground planting. If using pots, choose very large, sturdy containers and ensure consistent watering and feeding.
What is the blooming period?
These sunflowers typically bloom from July through September, providing color for a significant part of the summer and early autumn.
Troubleshooting
Seeds not germinating
Ensure seeds are planted at the correct depth, soil is kept consistently moist, and the temperature is adequate (above 10°C). Check seed viability if very old.
Plants are stunted or growing slowly
Verify they are receiving enough sunlight (minimum 6-8 hours daily) and that the soil is well-drained. Poor soil quality might require fertilizing.
Seedlings are eaten by slugs or snails
Use slug pellets, beer traps, or apply barriers like crushed eggshells around young plants.
Plants falling over
Install stakes or supports early in the plant's growth, especially in exposed or windy locations.
Flower heads not developing properly
Ensure adequate sunlight and water. Extreme weather conditions or nutrient deficiencies can also affect flower development.
Pros and Cons
Pros
- Easy to grow from seed.
- Produces very tall and large flowers.
- Long flowering period from mid-summer to early autumn.
- Adds significant visual impact to gardens.
- Suitable for direct sowing, simplifying planting.
Cons
- Requires significant space due to mature height.
- Can be susceptible to pests like slugs and snails.
- May need support (stakes) to prevent lodging in windy conditions.
- Less suitable for very small gardens or containers.
- Single-season plant (hardy annual).
Setup, Compatibility & Care
Setup (Sowing):
- Choose a sunny location with well-drained soil.
- Sow seeds directly into the ground after the risk of frost has passed (typically late spring).
- Plant seeds about 2.5 cm deep and 15-30 cm apart. Spacing depends on desired density and mature size.
- Water gently after sowing.
Compatibility:
- Soil: Prefers fertile, well-drained soil. Can tolerate a range of soil types but performs best with added compost.
- Sunlight: Requires full sun (minimum 6-8 hours daily) for best growth and flowering.
- Space: Due to their mature height (1.8-2.7m), ensure adequate space to avoid overcrowding and allow for air circulation.
Care:
- Watering: Water regularly, especially during dry spells, to ensure consistent moisture. Avoid waterlogging.
- Support: Tall varieties may require staking, particularly in windy areas, to prevent them from falling over. Insert stakes at the time of planting or when plants are young to avoid root disturbance.
- Feeding: If soil is poor, a balanced liquid fertilizer can be applied during the growing season.
- Pest Control: Monitor for slugs and snails, especially when seedlings are young. Netting might be needed to protect developing heads from birds or squirrels.