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Organic Skyscraper Sunflower Seeds

Organic Skyscraper Sunflower Seeds

San Diego Seed Company

Regular price $3.95 USD
Regular price Sale price $3.95 USD
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Product Details

Skyscraper Sunflower is one of the tallest sunflowers on the market! Easily reaching 10 feet into the air, they make for wonderful flowers on the north side of your garden. Plant these and marvel at their height and beauty!

Product Details

Approx Seed Count


Seed Weight

2G, .07oz

Botanical Name

Helianthus annuus

Planting Season 


Soil Temp

70° F+, 21°C+

Planting Depth

½”, 1.3cm

Area to Sow

25' row, 7.6m row

Days to Germ.


Days to Maturity


Best Planting Method

Direct or transplant

Thin to

≥2" apart, 5.4cm apart

Final Spacing

≥12" apart, 30.5cm


14 days

Plant Spread

36-40", 1-1.5m

Plant Height

108-144", 2.7-3.7m


Planting by Zones

Zones 9-10

  • Sunflowers can be grown year round in Zones 9 and 10 but are the happiest in the warm season.

Zones 2-8

  • Direct sow seeds in the spring once soils have warmed.

Planting Sunflower

  • In Zones 9 and 10, you can direct seed or transplant out your sunflower plants. We recommend you direct seed into freshly irrigated soils.
  • To direct sow, plant seeds in debris-free, well-worked soil that has been deeply watered. Cover with 1″ (2.5cm) of finely sifted soil.
  • If you are planting seeds in starter pots, plant seeds into thoroughly moist high-quality seed starting soil. Place seeds on top of the soil and cover with 1″ (2.5cm) of finely sifted soil.
  • Once your sunflowers have germinated and the first set of true leaves show, fertilize with an organic liquid fertilizer. When the plants are 3-4″  (7.6-10.2cm) tall you can plant them out into the garden. Space at least 12″ (30.5cm) apart.

Growing Sunflower

  • Sunflower plants should be planted into well-worked soils for the best blooms. In Zones 9 and 10, adding tons of compost will help create a healthy soil structure and keep soil moistures in, which is key.
  • Mulching heavily around your plants will also help with weed suppression and moisture retention.

Harvesting Sunflower

  • Harvest sunflower blooms when the flowers are almost fully open.
  • Harvest early in the morning and place blooms directly in a vase of room temperature water.

Growing Sunflower in Containers

  • You can grow sunflower in a container but make sure your container is at least 10″  (25.4cm) deep. Keep in mind containers will dry out faster because they have more surface area and less soil to hold onto moisture. Mulch heavily on the top layer of soil in the pot to keep the soil from drying out or heating up too much.

Southern California Pro Tips

  • Mulch heavily around your sunflower plants to ensure the soil does not dry out or overheat.
  • Do not overhead water as this promotes foliar diseases.

Companion Flowers/Crops

  • Sunflowers look beautiful with other cut flowers like cosmos, zinnia, scabiosa, and strawflower.

Additional Learning Resources

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