Site Navigation

See Categories

Our Products: Sunflower Seeds
Grey Striped Mammoth Sunflower Seeds
Grey Striped Mammoth Sunflower Seeds

Grey Striped Mammoth Sunflower Seeds

Price: $1.29

Quick Facts:

  • Packet Contains: 10 seeds
  • Plant Height: 10 feet
  • Life Cycle: Annual
  • Seed Type: Open-pollinated
Plant Features

Grey Striped Mammoth sunflowers are giants in the garden, growing up to 10 feet with 12-inch blooms. Known for their heavy seed production, they're perfect for both snacking and attracting wildlife, making them a valuable addition to any landscape.


Sunflower Sowing Guide


Outdoor Sowing (Directly in the Garden)

  • Timing: Sow sunflower seeds outdoors once the soil has warmed to at least 50–60°F, typically in late spring. Sunflowers are sensitive to frost, so make sure all risk has passed.
  • Location: Choose a sunny spot with at least 6–8 hours of direct sunlight per day. Sunflowers thrive in full sun and require well-draining soil.
  • Soil Preparation: Loosen the soil to a depth of 6–8 inches, enriching it with compost or organic matter for added nutrients. Sunflowers grow best in slightly acidic to neutral soil (pH 6.0 to 7.5).
  • Planting Seeds:
    • Sow seeds 1 inch deep and space them 6 inches apart.
    • For larger sunflower varieties, thin seedlings to 12–18 inches apart once they reach 3–4 inches tall to allow space for growth.
  • Watering: Keep soil moist until germination, which usually takes 7–10 days. Once established, water sunflowers deeply but infrequently, allowing the soil to dry slightly between waterings to encourage deep root growth.

Indoor Sowing (Starting Seeds Indoors)

  • Timing: Start sunflower seeds indoors 2–3 weeks before the last frost date to give them a head start.
  • Containers: Use individual pots, as sunflowers have sensitive roots that can be disturbed by transplanting.
  • Planting:
    • Sow seeds 1 inch deep, placing 1 seed per pot.
    • Cover lightly with soil and mist gently with water.
  • Germination:
    • Keep the temperature around 70–75°F for optimal germination.
    • Sunflowers typically germinate within 7–10 days.
  • Transplanting: Carefully transplant seedlings outdoors once the soil has warmed and all frost danger has passed. Plant 12–18 inches apart for large varieties, or closer for smaller types.

General Care Tips for Sunflowers

  • Sunlight: Provide full sun with at least 6 hours of direct light daily to ensure strong growth and vibrant blooms.
  • Watering: Water deeply once a week to encourage deep root growth. Increase frequency during hot or dry periods, but avoid overwatering.
  • Fertilizing: Sunflowers are light feeders, but they can benefit from a balanced fertilizer at planting. For larger varieties, consider side-dressing with a high-nitrogen fertilizer mid-season.
  • Staking: Tall or multi-branched sunflowers may need staking, especially in windy areas, to prevent them from toppling.
  • Weeding: Keep the base of the plant free from weeds, which can compete for nutrients and moisture. Mulching around the base helps retain soil moisture and reduces weed growth.
  • Deadheading: Remove spent blooms to encourage continued flowering, especially for branching varieties. For single-stem varieties, harvest blooms before they start to seed for cut flowers.
Product Reviews
Write your own review
Rate this product:  1   2   3   4   5