Every purchase supports the work of the RHS Every purchase supports the work of the RHS
  • delphinium
  • Eventual height: 1.7m
  • Eventual spread: 0.75m

Delphinium 'Black Knight Group'

delphinium

£17.97 £11.98
Pot size 2 + 1 FREE 9cm pots
2 + 1 FREE 9cm pots
9cm pot
Quantity

  • Position: full sun
  • Soil: fertile, well-drained soil
  • Rate of growth: average
  • Flowering period: June and July
  • Hardiness: fully hardy

    Stately spires of semi-double, deep purple flowers, opening in June and July on tall stems. These dark-eyed delphiniums look fantastic planted in bold clumps as part of a cottage-garden scheme or towards the back of a well-drained, sunny border, where they will add height and bold splashes of colour. They also make excellent cut flowers.

  • Garden care: Protect young foliage against slug and snail damage in spring. Stake with bamboo canes in mid-spring, before the flowers appear. During the growing season, apply a balanced liquid fertiliser every 2-3 weeks and wearing gloves cut back the faded flower-stems to a flowering side-shoot to encourage repeat flowering. At the end of autumn cut back and compost the faded flower stems.

  • Harmful if eaten
Share

Goes well with...

  • Achillea Moonshine
    Achillea 'Moonshine'
    £8.99 £6.99 Buy
  • Anemone hupehensis var. japonica Pamina
    Anemone hupehensis var. japonica 'Pamina'
    £5.99 Buy
  • Astrantia major Rubra
    Astrantia major 'Rubra'
    £6.99 Buy
  • Echinops bannaticus Taplow Blue
    Echinops bannaticus 'Taplow Blue'
    £5.99 Buy