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PlantFiles: Larkspur, Candle Delphinium
Delphinium 'Summer Skies'

Family: Ranunculaceae (ra-nun-kew-LAY-see-ee) (Info)
Genus: Delphinium (del-FIN-ee-um) (Info)
Cultivar: Summer Skies
Additional cultivar information: (Pacific Giant Series, aka Pacific Giant Summer Skies)

9 members have or want this plant for trade.


36-48 in. (90-120 cm)

18-24 in. (45-60 cm)

USDA Zone 3a: to -39.9 C (-40 F)
USDA Zone 3b: to -37.2 C (-35 F)
USDA Zone 4a: to -34.4 C (-30 F)
USDA Zone 4b: to -31.6 C (-25 F)
USDA Zone 5a: to -28.8 C (-20 F)
USDA Zone 5b: to -26.1 C (-15 F)
USDA Zone 6a: to -23.3 C (-10 F)
USDA Zone 6b: to -20.5 C (-5 F)
USDA Zone 7a: to -17.7 C (0 F)
USDA Zone 7b: to -14.9 C (5 F)
USDA Zone 8a: to -12.2 C (10 F)
USDA Zone 8b: to -9.4 C (15 F)

Sun Exposure:
Full Sun

All parts of plant are poisonous if ingested

Bloom Color:
Light Blue

Bloom Time:
Mid Summer
Mid Fall


Other details:
Average Water Needs; Water regularly; do not overwater

Soil pH requirements:
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)
7.9 to 8.5 (alkaline)

Patent Information:
Unknown - Tell us

Propagation Methods:
By dividing the rootball
From herbaceous stem cuttings
Allow cut surface to callous over before planting
By air layering

Seed Collecting:
Allow pods to dry on plant; break open to collect seeds
Seed does not store well; sow as soon as possible

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By PinetopPlanter
Thumbnail #1 of Delphinium  by PinetopPlanter

By RosinaBloom
Thumbnail #2 of Delphinium  by RosinaBloom

By bootandall
Thumbnail #3 of Delphinium  by bootandall

By momcat
Thumbnail #4 of Delphinium  by momcat

By beansandpenney
Thumbnail #5 of Delphinium  by beansandpenney


3 positives
No neutrals
No negatives

Gardeners' Notes:

Positive PinetopPlanter On Jul 30, 2009, PinetopPlanter from Auburn Four Corners, PA (Zone 5a) wrote:

I've grown delphiniums before, always from seed, and this one was no exception. It grew easily and, to my surprise, bloomed the first year. Each plant had one well filled spike with short lateral branches. The height at blooming was around 5 to 5.5 feet tall.

This was nothing compared to how they bloomed in this, their second year! Each plant had at least 10 spikes easily over 7.5 feet tall! The effect was spectacular; the blue was unearthly/beautiful. We do not do anything out of the ordinary in the way of fertilizer; the garden is organic with buried kitchen scraps being the only fertilizer added.

I don't know how they will come back next year, since they seemed to literally bloom their hearts out (and were for the most part flattened by a severe wind storm), but even if they don't come back, the show was worth it.

I would grow these again in a heartbeat!

Positive beansandpenney On Feb 15, 2009, beansandpenney from Orchard Park, NY (Zone 5a) wrote:

This delphinium has the most beautiful color I have ever seen, so delicate. It did bloom the first year. These came in a fall shipment, I think as a "freebie" or "buy one get one" and I literally threw them into the ground down by the mailbox. I don't think I even mulched. It was my surprise when this beauty came poking through. I bought 3 more!

Positive mikesmets On Jul 23, 2008, mikesmets from Waterbury, CT wrote:

The flowers are beautiful. Bloomed first year.


This plant has been said to grow in the following regions:

Ouray, Colorado
Waterbury, Connecticut
Bridgehampton, New York
Orchard Park, New York
Meshoppen, Pennsylvania
Salt Lake City, Utah

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