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Growing Larkspur

Growing Larkspur

Giant Imperial Mix


An old-fashioned, cold-tolerant annual cut flower and bedding plant. Flowers hold color well after drying and are often used in dry arrangements. Requires cool temperatures for germination, and germinates poorly at warmer temperatures (65 F or above). Plants are somewhat difficult to transplant and best sown in the garden in mid to late spring 4 to 6 weeks before the last spring frost. Seed can be put between two moist (not wet) paper towels in a plastic bag and refrigerated for 1 to 2 weeks to help improve germination. Can start indoors 4 to 6 weeks before outdoor sowing time. In mild winter climates (hardiness zone 7 or above) seed can be sown in early fall for blooming the following spring. Plant seed about 1/8 inch deep.


Prefers full sun and moist, well-drained soil. Remove faded flower stems to encourage reblooming. Plants may benefit from staking or support, particularly in windy areas. Prefers cool climates and dislikes hot, humid climates. May reseed in the garden, especially in mild winter areas.

Fertilizer Recommendations

Use low rates of Algoflash Flowering Plant 4-6-7 Liquid Fertilizer (51087), Neptune Fish & Seaweed Fertilizer 2-3-1 (51221), or Osmocote 14-14-14 (51173).

Alternative Products

Blue Fountains Delphinium (08657) is a similar perennial plant. Oklahoma Mix Zinnia (08100) and Pastel Mix Statice (07830) are other annual cut flowers.

Complimentary Products

Low to moderate feeders that appreciate occasional fertilization. Other cold-tolerant annuals include Mix Cool Wave Pansy (07280) and Rocket Hybrid Mix Snapdragon (05139).

Product Recommendations

 Plantable 3" Round Jiffy Peat Pots (53226) can improve transplant success.

Larkspur Facts

Usually not affected by pests or diseases. Root rot diseases can be a problem when grown in overly wet or poorly drained soils. Aphids sometimes attack plants. Related to perennial Delphiniums, and once classified as a Delphinium.

Growing Tips