Delphinium 'Guardian Blue' in flower, deep blue spikes with white centres

Delphinium 'Guardian Blue'

Delphinium 'Guardian Blue' is an F1 hybrid candle delphinium from the Guardian Series, with tall, sturdy spikes of semi-double, deep royal blue florets, each with a striking white centre (the 'bee'). Bred for early, uniform flowering and strong mid-sized stems that rarely need staking, it doesn't need the winter chill most delphiniums do. Flowers in summer, and removing spent spikes encourages a second flush into autumn. A favourite for cottage gardens, borders and cut-flower vases, and loved by bees and butterflies.

PLANT FEATURES

  • Colour: Deep blue with a white centre
  • Height: 70cm to 110cm
  • Width: 25cm to 45cm
  • Flowering: Summer to autumn
  • Position: Full sun to part shade, in fertile, well-drained soil, sheltered from strong wind

Note: All parts of the plant are toxic if eaten, including to pets.

See similar: Blue | cottage garden | perennial

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As recommended by the Swiss Rose Garden Nursery.

  1. Dig a hole 60cm wide and 60cm deep. If the topsoil is usable, separate it from the sand as it can be re-used in the hole. When planting roses in an existing rose bed or where roses have been previously grown during the last 5 years, the soil must be replaced.
  2. Mix together a mixture that contains 2 parts topsoil, 2 parts compost, 1 part manure or buy a Soil Improver, Landscaping or Rose Soil mix from a Landscape supply place. About 100 litres per planting hole is recommended.
  3. A layer of manure can be placed at the bottom of the hole and then the hole filled with the above soil mix.
  4. Place one handful of slow-release fertilizer at 20cm depth from the top where the roots of the newly planted rose will be situated.
  5. Soak the soil thoroughly and lightly compact.
  6. Now plant the rose in this mix with the surface of the plant even with the surface of the prepared area, e.g., the graft union should be about 5 to 10 cm above soil level.
  7. Water every day for the first six months from October onwards, up to 10 litres per day during warm weather is recommended for strong deep root development.
  8. Plant roses 1m to 1.2m apart.

Enjoy the beautiful roses!