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Black Knight Delphinium Plants (Delphinium Pacific Giants Black Knight)Black Knight Delphinium Plants (Delphinium Pacific Giants Black Knight)

Black Knight Delphinium Plants

Delphinium Pacific Giants Black KnightFeefo logo

The details

  • Colour: dark purple
  • Flowering: Jun-Jul
  • Foliage: dark green, deeply divided
  • Height: 1.7m
  • Spread: 75cm
  • Spacing: 60cm
  • Position: full sun
  • Soil: well drained, fertile
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£ 5.82

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Pacific Giants Black Knight Delphinium

Black Knight is a stunning plant with its lofty flower spikes, up to 1.7m, stacked from top to bottom with double blooms in a regal shade of purple. Each flower on this delphinium is a little trumpet, black at the centre, and the leaves, further down, are glossy, deeply divided and vine-like. The buds come in May, opening in June and continuing through to July. Cut back the spent flower stems and you'll be rewarded with a second flush of smaller flowers in late summer. It makes a lovely cut flower, lending a stately, regal quality to indoor arrangements.

Browse our other delphiniums, or all of our perennial plants.

In the garden

Delphiniums need sun, with well-drained fertile soil. So dig in plenty of compost when planting. And don't plant too early in the season – give them time to bulk up before you plant them out from their pots or they can become ruined by ravenous slugs and snails. And when you do plant them out, it's worth placing slug or snail traps nearby, or surrounding them with a barrier of broken shells, just to make sure. Obviously they're tall so position your delphiniums towards the back of a south- or west-facing border, where they'll grow up to create the most wonderful vertical accents, contrasting handsomely with the rounded, spreading and fan shapes of your other border perennials. You'll need to stake them in late spring to protect from wind damage later on; do it any later and you'll risk not being able to get at them through the foliage and tall growth. It's a good idea to feed every 2-3 weeks in the flowering season. And cut back individual spent flower stems. Do these two things and you'll be rewarded with a second, less dramatic, flowering by the end of summer.

A true classic among cottage garden perennials, delphiniums combine beautifully with roses (try a pink one with a little blue in it, such as Gloire de France for a heavenly combo), euphorbias, lavender, lady's mantle, achillea, anthemis and a host of other colourful border perennials.


  • Colour: dark purple with black centres
  • Flowering: Jun-Jul
  • Foliage: dark green, deeply divided and vine-like
  • Height: 1.7m
  • Spread: 75cm
  • Spacing: 60cm
  • Position: full sun
  • Soil: well-drained, fertile

Fun fact

Delphinium is named after the Greek, delphin, for dolphin. Look closely and you might just spot the individual flowers' resemblance to this fabulous sea creature.

Cultivation Instructions

Dig in garden compost or leaf mould when planting, in full sun. Space 50-60cm apart and water in well. Keep watered until established.

Keep watered until established. Stake in late spring. Cut down spent flowers stems. Feed every 2-3 weeks in flowering season and protect from slugs and snails.