Giant sunflowers tower over the garden attracting birds, providing vertical interest and are strong enough to support vines such as morning glories and beans. While sometimes giant sunflowers are available in nurseries, they can be expensive and do not always appreciate being transplanted. However, it is easy to learn how to grow giant sunflower seeds and enjoy large swathes of their gigantic blooms economically.
- Skill level:
- Moderately Easy
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Things you need
- Shovel, compost and garden bed or pots and potting soil
Select spot in full sun where you would like to plant giant sunflower seeds.
Prepare soil for planting when soil temperatures have warmed, between one and three weeks after date of last frost. Use shovel to loosen soil to a depth of at least 1 foot. Clear soil of weeds. Enrich soil with composted organic material.
Plant giant sunflower seeds about two to three times as deep as the length of the seed from 1 to 2 feet apart depending on variety. Check package instructions for recommended spacing for your seeds.
Pat soil firmly over seeds.
Water seeds. Continue to water regularly as needed to keep soil moist.
Fertilise with organic flower food when seedlings appear.
Tips and warnings
- If planting giant sunflower seeds in pots, place pots in groups near a building or other vertical structure, as plants will tip over as they grow.
- Consider planting sunflowers near plants that prefer partial shade, such as lettuce. Be certain not to plant giant sunflower seeds where they will shade plants that need full sun such as most vegetables and sun-loving flowers and herbs.
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