Delphinium Blue Buccaneers | Electric Blue Spires That Rebloom

Delphinium Blue Buccaneers is a compact New Zealand hybrid perennial that produces electric dark-blue semi-double blooms with black centers on strong 3-to-5-foot spires from late spring through fall, with better heat tolerance than older varieties.

Most delphiniums give you one spectacular show in early summer and then fade into a mess of yellowing foliage. The New Millennium™ ‘Blue Buccaneers’ breaks that cycle. Its rebloom habit means you can cut back the first flush and get a second round of those intense blue, black-eyed flowers in late summer. And it handles warmer, more humid growing conditions than the standard Pacific Giants your grandmother grew. The trade-off is staking — those spires are heavy with blooms, and a summer thunderstorm can lay them flat if you haven’t put a bamboo cane beside each one.

What Makes Blue Buccaneers Different From Other Delphiniums

This cultivar belongs to the New Millennium™ series, bred in New Zealand specifically for warmer climates and stronger stems. Compared to an older blue like ‘Cobalt Dreams,’ Blue Buccaneers stays shorter (3 to 5 feet versus the 6-foot-plus range), the blue is more intense, and every flower carries a true black “bee” spot at the center — not a dark brown or purple, but actual black. The blooms are semi-double, meaning they have extra petals layered in from the second row, which gives them a ruffled, full look on the spike.

Delphinium Blue Buccaneers Specs at a Glance

Do Blue Buccaneers Need Full Sun or Can They Take Shade?

Full sun produces the tallest, most densely packed spires. But if your garden has a spot that gets morning sun and afternoon dappled light, that works too — you’ll still get good bloom, just maybe a slightly shorter spike. The minimum is three hours of direct sun per day. Below that, the stems get lanky and try to lean toward the light, and the flower count drops. Good air circulation matters at least as much as sun: crowded planting traps moisture and invites powdery mildew, even on a variety bred for better resistance.

Planting and Care That Match This Hybrid

Soil Prep and Spacing

Enrich the planting hole with compost or well-rotted manure. Use a granular balanced fertilizer at planting time, then repeat monthly through July — but stop after that to let the plant harden off for winter. Space each plant 18 inches center-to-center. Set the crown at or just below the soil surface. If your soil runs acidic (below pH 6.5), mix garden lime into the bed before planting; this hybrid prefers slightly alkaline conditions.

Watering the Right Way

Water regularly but let the top 2 to 3 inches of soil dry out between waterings. The fastest way to kill a delphinium is to keep its feet wet. Soaker hoses or drip irrigation are best — they keep water off the foliage, which cuts disease risk dramatically. Overhead sprinklers on a humid evening are asking for powdery mildew even on a resistant variety.

Staking: Non-Negotiable

The spires on Blue Buccaneers are thick and strong for a delphinium, but they’re carrying a lot of weight. Put a sturdy bamboo cane or metal stake close to each crown early in the season, before the spike takes off. Tie the stem loosely with soft garden twine at 12-inch intervals. If you wait until the spike is already leaning, you’ll break it trying to straighten it.

Deadheading for That Second Bloom

As soon as the first flush of florets fades, cut the entire spent spike down to the basal foliage. Don’t just pull off individual dead florets — cut the whole stem. Within a few weeks, the plant will produce a second, slightly shorter round of spires. If you leave the old spikes on, the plant goes to seed and stops blooming for the season.

Winter Prep

After frost kills the top growth, cut the stems back to about 6 inches. Cover the crown with 4 to 5 inches of organic compost or shredded bark mulch. In spring, brush that mulch off as soon as you see new shoots emerging; leaving it on can smother the crown or trap moisture against new growth.

Common Mistakes Even Experienced Gardeners Make

The three mistakes that account for most Blue Buccaneers failures are: not staking early enough (one summer storm and your spike is broken at the base), planting in heavy clay that stays wet (the roots rot before you realize there’s a problem), and letting the spent spikes sit through July (you lose the entire late-summer rebloom). A fourth that catches people off guard is planting in acidic soil without adding lime — the plant survives but never reaches full height and the blue looks washed out.

Blue Buccaneers vs. Other Blue Delphiniums: What Changes

Buying Tips for 2026

Romence Gardens lists Blue Buccaneers at $16.99 for a 5.25-inch square pot as of early 2026 but shows it backordered — expect it to ship when stock returns later in the season. Bloomin Designs sells a 30-plant flat of plugs (3 inches deep by 2 inches wide) if you’re planting a whole border. Home Depot carries a dormant bare-root starter pack. For in-person shoppers, Phoenix Perennials and Proven Winners stock this variety at independent garden centers. Seed-grown plants occasionally throw lighter blue offspring, so if uniformity matters for a formal bed, buy named cuttings or verified plugs rather than seed.

Blue Buccaneers Care Checklist

Tuck this sequence into the same season you plant. Stake early, water at the base, cut the first spikes the day they fade, brush spring mulch off the crown, and add lime if your soil tag reads below 6.5. That’s the entire routine. If you skip the deadheading, you get one flush and a lanky plant; if you do it, you get two — and that’s the difference between a delphinium that looks good for two weeks and one that anchors your border from June through September.