Delphinium Black Knight 11cm Pot

Delphinium ‘Black Knight’ – A Dramatic Dark Blooming Perennial

Delphinium ‘Black Knight’ is a striking perennial renowned for its tall spikes of deep, almost black-purple flowers that bloom in early to mid-summer. Its strong, upright stems and finely divided foliage create architectural interest, while the dramatic, richly coloured blooms add height, drama, and elegance to borders, cottage gardens, and mixed perennial plantings. This long-flowering variety is ideal for gardeners seeking bold contrast and vertical impact in their designs.

Why Grow Delphinium ‘Black Knight’?

Dark, Dramatic Flowers – Tall spikes of nearly black-purple blooms.

Architectural Form – Upright, strong stems add height and structure.

Long Flowering Season – Early to mid-summer colour for extended impact.

Pollinator Friendly – Attracts bees and other beneficial insects.

Versatile Planting – Performs well in borders, cottage gardens, and perennial mixes.

Height and Spread

Typically grows to 120–180cm (4–6ft) in height, with a spread of 45–60cm (18–24in).

Where to Site Your Delphinium ‘Black Knight’

• Borders: Provides striking vertical and colour impact

• Cottage Gardens: Naturalistic, romantic planting

• Mixed Perennial Beds: Adds height and contrast

• Pollinator-Friendly Gardens: Supports bees and insects

• Cut Flower Gardens: Excellent for floral arrangements

How to Grow and Care

Soil – Prefers fertile, well-drained soil rich in organic matter.
Light – Full sun for best flowering.
Watering – Keep soil evenly moist, especially during dry spells.

Maintenance

Staking: Strong stems benefit from staking to prevent flopping.
Deadheading: Remove spent flowers to encourage prolonged bloom.
Mulching: Helps retain moisture and enrich the soil.
Pests & Diseases: Generally pest-resistant; monitor for slugs and snails.

Perfect Plant Combinations

• Perennials: Foxglove, Digitalis, Nepeta

• Grasses: Miscanthus, Pennisetum for texture contrast

• Shrubs: Hydrangea, Philadelphus

• Companion Colours: Whites, soft pinks, and blues for dramatic contrast

Conclusion

Delphinium ‘Black Knight’ is a dramatic, tall perennial with nearly black-purple flower spikes and architectural foliage. Perfect for borders, cottage gardens, and cut flowers, it provides bold vertical impact, long-lasting blooms, and garden drama with minimal fuss.

Delphinium Black Knight 11cm Pot Grasslands Nursery Purple

Does the height include the pot?

No, we measure from the top of the pot to the tip of the plant except for some of the instant planted screens, in this case it will be stated in the description

How long does delivery take?

Most orders are delivered in just a few days, Smaller items are often sent with Parcelforce on a next day service, Larger items should allow up to 10 days due to the size of the items they often have to be sent on our own transport.

Where will you leave my plants?

We will leave your order at the front of your property, Parcelforce may
leave your items in a safe place if you let us know, Pallet couriers
will require a flat hard surface to deliver to, no gravel or soil, a
driveway or parking spot would be best. Most importantly Deliveries by
pallet courier will require access for a large truck (bin lorry sized)
to get near the delivery point. Deliveries sent on our own transport may come in a small van or larger truck.