Delphinium 'Black Knight' renowned for its dramatic, deep-purple flower spikes that soar to impressive heights in the garden. This perennial beauty showcases densely packed, semi-double blooms with a velvety texture, creating a captivating contrast against the backdrop of lush, green foliage. 'Black Knight' stands tall and stately, making it a stunning focal point in borders, cottage gardens, or as a cut flower for striking floral arrangements. With its vigorous growth habit and sturdy stems, this variety is a favourite among gardeners seeking to add vertical interest and rich, dark hues to their landscape. While 'Black Knight' requires consistent moisture and protection from strong winds, the breathtaking beauty it brings to the garden makes it a worthy addition to any landscape design. 


Delphinium 'Black Knight' 9cm

Estimated delivery between 19 -22 Jul

Free Standard Delivery over £150
Eco Friendly Packaging Materials.
We are rated Excellent on Trustpilot.

Product Information

✓ Show stopping flower spikes above mounds of soft green foliage

✓ Can reach heights of 1.5m

✓ Make excellent cut flowers

✓ Attractive to Butterflies and Bees

✓ Plant in fertile, well drained soil

✓ Plant in Full Sun or Partial Shade

✓ Supplied in a 1.5L Growers Pot

Delivery Options

Our cost for Standard Delivery is £5.99. This price is the same regardless of how many items you purchase! If you spend £150.00 or above, Standard Delivery is free. Standard Delivery takes 2-6 Working Days.  

Next Working Delivery is £9.99. Please place your order by 2pm Monday – Thursday. Please note deliveries are carried out by a third party courier; therefore, we cannot guarantee our Next Day Delivery Service. During very busy periods, Next Working Day delivery may be temporarily unavailable. 

Postcode and delivery exclusions apply.  


This plant is a herbaceous perennial. Herbaceous perennials die back below ground level each autumn, then fresh new growth will appear in the spring. Stake the tall stems before the flowers appear. Feed throughout the growing season. Cut back spikes of faded flowers to a side shoot to encourage a second flush of flowers. Cut back foliage in autumn to ground level. 

Harmful to human and pets if eaten. Irritant to skin and eyes.  

Images are used for illustrative purposes only. Due to the maturity of the plant and the time of the year, plants may not arrive looking like our images. 

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150cm x 80cm
Full Sun/Partial Shade
Fully hardy

Frequently Asked Questions

If you order by 2:00pm Monday - Thursday (Excluding Bank Holidays) and select 'Next Working Day Delivery' we aim to deliver your order on the Next Working Day.

If you select Standard Delivery you will receive your order in 2-5 Working Days from the day your order was placed.

95% of the plants we have in stock on our website can be planted 365 days a year providing the ground is not frozen or waterlogged at time of planting.

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We take the upmost care in selecting and packaging our plants to dispatch.

If you are not 100% happy with your order, please let us know. Ensure that you please return your order back to us within 28 days and we can either issue a refund or send out replacements!

Of course, please contact us on 01706 881 422 to talk to a member of our friendly team.

We do now allow collections under any circumstances, however with our Next Working Day Delivery you can receive your order the very next day* !