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Dwarf Delphinium   Summer Blues (Delphinium grandiflorum)

Delphinium grandiflorum 'Summer Blues' is a wonderfully compact plant that is blanketed with 1½" sky blue flowers in early summer. 'Summer Blues' has better heat tolerance and is earlier blooming than other Delphiniums.

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Plant Types: Perennial
Light: Partial Shade to Full Sun
Height: 10 inches to 1 foot
Width: 1 foot
Zones: 3a to 8b
Bloom Color: Blue
Bloom Seasons: Late spring, Early summer
Leaf Color: Green
Special Features: All or parts of this plant are poisonous, Attracts birds, Deer resistant, Naturalizing, Not North American native, Rabbit resistant
Shape: Upright or erect
Fertilizer: Miracle-Gro® Water Soluble All Purpose Plant Food
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Plant Care

In areas that have mild winters, sow Delphinium seeds in flats or pots in the summer. Transplanted plants should be planted in early fall for spring and summer flowering.

Plant Growth:

Delphiniums are perennial plants although they are sometimes treated like an annual or biennial. Delphinium does best in full sun.


Many Delphiniums are blue, but they come in several colors including white, various shades of red, pink, lavender and purple.

Soil and Irrigation:

Plants need rich soil. Poor soil should be amended with soil conditioners, such as lime for strongly acidic soils. It is important not to cover the root crowns with soil.


Thrive with regular fertilization; during growth, every 2 to 3 weeks.


Deadhead somewhat regularly. In fall, cut plant to the ground.


Slugs, snails, and cyclamen mites. Other problems include Southern blight, powdery mildew, bacterial and fungal spots, crown and root rot, gray mold, white rot, rust, damping off, white smut, and leaf smut.