Delphinium ‘Guardian Blue’

USDA Zone: 3-9

Delphiniums are the stars of the early summer border. Plants form a low mound of deeply-cut green leaves, bearing tall spikes of satiny flowers. This mid-sized selection has deep-blue petals and strong stems that are great for cutting. Removing faded spikes at the base will encourage repeat blooming in fall. In hot, humid summer regions, plants do not usually last more than 2 to 3 years. Plants are often attacked by mildew in mid summer; simply cut back hard to encourage fresh foliage. Use a high phosphorous fertilizer each year, in early spring. CAUTION: Harmful if eaten.

Sun Exposure 
  Full Sun

Soil Type 
  Sandy or
  Clay

Soil pH 
  Neutral or
  Alkaline or
  Acid

Soil Moisture 
  Average or
  Moist

Care Level 
  Moderate 

Flower Colour 
  Deep Blue 

Blooming Time 
  Early Summer  
  Mid Summer 

Foliage Color 
  Deep Green 

Plant Uses & Characteristics 
  Accent: Good Texture/Form  
  Attracts Hummingbirds  
  Border  
  Cut Flower  
  Deer Resistant  
  Drought Tolerant  
  Massed  
  Poisonous/Toxic 
  Specimen 

Flower Head Size 
  Very Large

Height 
   75-100 cm  
   29-39 inches

Spread 
   45-60 cm  
   18-23 inches

Foot Traffic 
   None 

Growth Rate 
   Medium

Photo courtesy of perennials.com