Triton Dark Blue Delphinium is a striking hybrid cultivar that brings dramatic spikes of deep blue flowers to the summer garden. Rising 36 to 48 inches tall with a spread of 24 to 36 inches, this hardy perennial thrives in zones 3 through 3 and blooms prolifically from June through August in full sun. The dense flower spikes attract pollinators while resisting deer pressure, making it a reliable choice for northern gardens seeking architectural elegance and season-long color.
1
Full Sun
Moderate
3-3
48in H x 36in W
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Moderate
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Deep blue spikes that command attention in any planting scheme, Triton delphiniums bloom reliably through the heart of summer and require only moderate watering once established. The flowers rise tall enough to create true vertical interest without becoming floppy or demanding constant staking. Deer leave them untouched, and the blooms draw butterflies and bees throughout their long flowering window. For gardeners in colder zones, the hardiness to zone 3 means these plants return year after year with minimal fuss.
Triton Dark Blue Delphinium is grown as a cut flower and landscape specimen, prized for its tall spikes that anchor the back of perennial borders and provide vertical structure to mixed plantings. The deep blue color works particularly well in cottage gardens and cutting beds where the long stems can be harvested at peak bloom.
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Start seeds indoors 8 to 10 weeks before your last frost date. Sow seeds at 1/8 inch depth in a sterile germinating mix with vermiculite, keeping the medium moist but not waterlogged. Darkness is needed for best germination. Keep seedlings at 65 to 70 degrees Fahrenheit until germination occurs (expect sprouting in 10 to 21 days), then move them to a cooler location at 50 to 55 degrees Fahrenheit to grow on sturdy and compact.
Transplant seedlings outdoors after the last frost date once they have developed true leaves. Harden off seedlings by gradually exposing them to outdoor conditions over 7 to 10 days before planting in their final location.
Direct sow seeds into a finely raked and deeply dug seed bed after frost has passed. Ensure good soil preparation with loose, well-draining texture.
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