Reviewing
Cosmos 'Sensation' Seeds26 Aug 2026
Can't go wrong with Cosmos
Lovely packet of seeds, bought one for me and one as gift :)
Gareth
Delphinium 'King Arthur' Seeds
Delphinium Pacific Giants 'King Arthur'
‘King Arthur’ Delphinium with magnificent blue spires.
A towering gem from the esteemed Pacific Giants collection, ‘King Arthur boasts majestic floral spires accentuated by contrasting white centres. These royal blooms elegantly define the back of garden borders, achieving peak brilliance, particularly in their second season. Requiring some patience, they mature beautifully, unfolding their true majestic form with time.
Approx 30 seeds
Only 1 left
- Pollinator-Friendly
- Sun Loving
- Hardy Perennial
- Big Gardens
Only 1 left
Delphinium 'King Arthur' Seeds – Quick Growing Guide
Delphinium 'King Arthur' seeds produce tall, striking perennial flowers ideal for UK gardens. Sow from March to June or August to October, with germination in 7–14 days. These delphiniums thrive in full sun and well-drained soil, requiring regular watering. Perfect for cut flower displays and adding height to borders.
How to Sow, Grow and Harvest Delphinium 'King Arthur' Seeds
- Sow:Mar–Jun, Aug–Oct
- Germination:7–14 days
- Grow:Full sun, well-drained soil, support tall stems
- Water:Keep soil moist but not waterlogged
- Harvest:Cut flowers when buds show colour for longest vase life
- Best for:Borders, cut flower beds, cottage gardens
Delphinium 'King Arthur' is a striking perennial known for its tall floral spires and vivid blue blooms with contrasting white centres. Ideal for adding height and colour to garden borders or cut flower displays. These seeds require patience but reward you with majestic flowers, especially in their second season.
Delivered within 2–3 working days. On its own, this packet ships letterbox delivery at £2.25. Fits through a standard letterbox, so no one needs to be home.
Delivery is priced on the size of your whole order, so adding more may move it into the next band:
- Letterbox delivery — small orders
- £2.25
- Standard delivery — most orders
- £4.50
- Standard delivery (multiple parcels) — large orders
- £7.50
- Free delivery (orders £60 and over)
- Free
Gifting. We can include a handwritten note — add your message at checkout.
More info in our FAQs, or get in touch if something hasn’t arrived.
Grow in Your Garden
Delphinium 'King Arthur' – Tall Cut Flower Seeds
Calendar
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SowFlowers / Harvest
How to Grow
Delphinium 'King Arthur' seeds should be started indoors in early spring, ideally from March to June, in a cool, bright spot to encourage healthy growth. Once the risk of frost has passed, transplant them outdoors into containers or garden beds where they can thrive.
Sowing
To improve germination, place the seeds in the refrigerator for about a week before sowing, then sow them indoors during the recommended months of March, April, May, June, August, September, or October.
Growing
After germination, pot on seedlings carefully and harden them off before planting out, ensuring they have enough space to grow tall, up to the recommended pot size of 45 cm, which supports their stature as tall cut flowers.
Plant care
Water Delphinium 'King Arthur' regularly to keep the soil moist but well-drained, especially during the growing months from June to September. Support the tall flower stems as needed and deadhead spent blooms to encourage continuous flowering throughout the season.
About Delphinium 'King Arthur'
Tall spires of bright blue flowers with white centres, perfect for cut flower gardens and borders.
- Pollinator-Friendly
- Sun Loving
- Hardy Perennial
- Big Gardens
History of Delphinium 'King Arthur'
Delphiniums symbolise cheerfulness, goodwill and joy. 'King Arthur' is a royal addition to your garden, representing encouragement and good fortune. These flowers are often gifted to remember loved ones fondly.
| Other Names | Larkspur, Lark's Heel, Lark's Claw and Knight's Spur |
|---|---|
| Pet/Baby Safe | Toxic |
FAQs
Sow from March to June, and August to October. Seedlings usually appear in 7–14 days. Watering: keep soil moist but not waterlogged.
They can self-seed if flowers are left to go to seed, but regular deadheading encourages better blooms.
Provide full sun, well-drained soil, and support tall stems to prevent flopping.
Yes — this is a straightforward packet to give, and what makes it work as a gift is mostly timing. Sowing runs March to June, and August to October, so a packet given inside that window can go straight in, and one given outside it keeps perfectly well until the season comes round.
There are approximately 30 seeds in the packet. On effort it needs some love, which matters if you are giving it to someone new to growing. It suits borders, cut flower beds and cottage gardens, so it works for a small space as well as a garden.
Reviews
No reviews yet for Delphinium 'King Arthur' Seeds. If you have grown it, yours would be the first.
Elsewhere in the range
Recent reviews of other Herboo seeds. These are not ratings of Delphinium 'King Arthur' Seeds.
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Good card gifts
Bought a couple of these as card gifts for friends and they loved them
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Good tips
Liked how you gave tips on how best to sow. nicely done
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