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Delphinium Seeds

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Delphinium is a beautiful blooming plant with tall spires of blossoms that bloom all summer long. 

Larkspurs bring height and color to summer garden borders with their tall spikes of colorful flowers. They prefer moist, cool summers and do not fare well in hot, dry weather.


Plant Name: Delphinium
Life Cycle: Perennials 
USDA Zones: 3 - 10
Height: 36 - 48 inches
Bloom Season: Summer through fall
Bloom Color: Lilac, Blue, Red, Pink, White
Environment: Full sun to partial shade
Soil Type: Moist, well-drained, pH 6.1 - 7.3

Package includes: Delphinium 100+ PCS Seeds


Temperature: 55F
Average Germ Time: 14 - 28 days
Light Required: No (darkness is required for germination)
Depth: Seeds must be covered thinly, no more than the thickness of the seed
Sowing Rate: 2 - 3 seeds per plant
Moisture: Keep seed moist until germination
Plant Spacing: 12 - 18 inches


  • Start seeds indoors 8-10 weeks before last spring frost.
  • Sow Delphinium seed in a seed-starting formula. Cover lightly.
  • Place tray in a plastic bag in refrigerator for 2 weeks to help germination.
  • Then place it in total darkness and maintain the soil temperature at 50-55F (10-12°C) until sprouted. Seeds may have poor germination if the soil temperature is above 55°F (13°C). 
  • As soon as seedlings emerge, provide plenty of light on a sunny windowsill. 
  • Delphinium seedlings do not need much fertilizer, feed when they are 3-4 weeks old using a starter solution.
  • If you are growing them in small cells, you may need to transplant the seedlings to 3 or 4 inch pots when seedlings have at least 2 pairs of true leaves before transplanting to the garden so they have enough room to develop strong roots.
  • Grow the transplants at 55°F (13°C) until ready to plant outside. Larkspur performs best where summers are cool.
  • Before planting in the garden, seedling plants need to be “hardened off”. Accustom young plants to outdoor conditions by moving them to a sheltered place outside for a week. Be sure to protect them from wind and hot sun at first. If frost threatens at night, cover or bring containers indoors, then take them out again in the morning. This hardening off process toughens the plant’s cell structure and reduces transplant shock and scalding.


Processing time 2-5 business days.
Estimated delivery time 3-9 days (depending on your location).


We're so sure that you will love our products here at Gardening Plants & Flowers, that we offer a 100% Satisfaction Guarantee. If you have any issues with your order, simply email us at and we'll do our GUARANTEED BEST to make things right for you.

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Delphinium Seeds
Regular price
Sale price
Shipping calculated at checkout.
Regular price
Sale price
Shipping calculated at checkout.

Customer Reviews

Based on 15 reviews
Rebecca Sauer

Looks like all the seeds germinated, I have A LOT of sprouts. Planted them in January and they’re getting their first true leaves (feb). Hoping to get lots of flowers in coming months.

Newell Franecki

The seeds arrived on time and in great condition.I'm expecting to have a beautiful garden next spring.

Amaya Sawayn

Almost every seed I sowed sprouted. really impressed by the quality of the seeds. will order again.

Grayce Klein

Great seeds that produce lots of plants.

Mary Stehr

I'm pleased with those flowers. They grew beautiful.

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