Delphinium, Black Knight (Dephinium x cultorum) - 25 Seeds seed packet from Seed Therapy – American - grown, heirloom seeds
Delphinium, Black Knight (Dephinium x cultorum) - 25 Seeds seed packet from Seed Therapy – American - grown, heirloom seeds
Delphinium, Black Knight (Dephinium x cultorum) - 25 Seeds seed packet from Seed Therapy – American - grown, heirloom seeds
Delphinium, Black Knight (Dephinium x cultorum) - 25 Seeds seed packet from Seed Therapy – American - grown, heirloom seeds
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Black Knight Delphinium – 25 Seeds

$1.99 $3.99

Add unmatched drama and regal height to your garden with our Black Knight Delphinium seeds. Celebrated as the darkest variety available, this magnificent heirloom perennial produces towering, 4 to 6-foot spires packed with intensely deep violet-purple blossoms, each centered with a striking black "bee" (the central petals). Creating a breathtaking vertical display in late spring and early summer, these showstopping stalks are the ultimate focal point for cottage garden borders and high-end floral arrangements.

⭐ What you'll love

  • The deepest, richest violet-purple color available in the delphinium family.
  • Towering 4 to 6-foot floral spires that create spectacular vertical architecture.
  • Naturally deer and rabbit resistant, making them ideal for unprotected borders.
  • Highly attractive to hummingbirds, bumblebees, and butterflies.

🌿 Seed details

  • Plant Name: Black Knight Delphinium (Delphinium x cultorum)
  • Seed Quantity: Approx. 25 seeds
  • Type: Heirloom, Open Pollinated, Non-GMO
  • Lifecycle: Perennial
  • Height: 4-6 feet
  • USDA Zone: 3-8
  • Origin: American Grown

🌱 Growing instructions

  • Sowing: Direct sow outdoors in late fall. For spring planting, cold-stratify seeds in the refrigerator with moist sand for 2-4 weeks prior to sowing. Indoor starts can be sown directly on the surface of a flat at 60-65°F.
  • Note on Soaking: If soaking seeds, both seeds that float and seeds that sink will be viable.
  • Depth: Plant seeds just below the surface (1/8 inch).
  • Transplanting: Move seedlings outdoors safely after the threat of spring frost has passed.
  • Light Requirement: Full Sun to Partial Shade.
  • Care: Flourishes in moist, rich soil. Side-dress with well-composted manure in spring. Staking is recommended for tall stalks in windy areas. Harvest for arrangements when 1/4 of the flowers are open.

✅ Our seed packets

  • Professionally designed and made.
  • Resealable for convenient, long-term storage.
  • Eco-friendly and recyclable (contains no plastic).
  • Includes full, detailed growing instructions.
  • Vigorously tested to ensure the highest germination rates.
  • Custom packets for weddings, baby showers, or events are available. Just message us!

🚚 Shipping

  • FREE SHIPPING on all orders of $35 or more.
  • Flat Rate shipping no matter how many seeds you order.
  • Tracking is included with every order.
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