Larkspur vs. Delphinium: Differences, Difficulty, and Growing Tips

Annual Larkspur (Consolida) vs. Perennial Delphinium

Larkspur (Consolida spp.)

• Annual, grown from seed.
• 3–4 months to bloom.
• Needs chilling period (refrigerate damp seeds 2 wks).
• Cool, moist, sunny conditions; alkaline soil.
• Bloom triggered by 16-hr day length (may need lights).
• Vase life ~1 week.

Delphinium Hybrids (Perennial)

• "King of the Border"—tall, intense blue spikes.
• New Zealand hybrids (Gold Standard) replace Pacific Giants.
• Bloom 2 weeks only; need rigorous daily staking.
• Wind + rain = heartbreak without perfect support.

Sources

• Seeds: Renee's Garden, Johnny's Selected Seeds.
• Plants: Graceful Gardens (NZ Delphiniums).

Zone 7½ Tip

Your cooler summers may suit larkspur better than hot climates. Delphiniums need rich, well-drained soil and meticulous staking.