Delphinium Ajacis is a perennial grown for its blue blooms, which open in summer and return year after year. Notably, it shrugs off deer. Its summer flowers are a moderate draw for native bees, butterflies, and hummingbirds.
Delphinium Ajacis — the short answer
Delphinium Ajacis: full sun, pH 6–7.5.
- Soil pH
- 6–7.5
- We haven't confirmed this against a published source yet.
- Sun
- Full Sun
- We haven't confirmed this against a published source yet.
Plant data: Growable Ground Plant Database, compiled from FAO ECOCROP, USDA PLANTS and university Extension sources — each tile names its own row's source, because per-field provenance varies.
Score Delphinium Ajacis on your exact land.
Zone averages can't see the slope, soil, frost, and sun that decide whether delphinium ajacis actually takes — and those shift from one yard to the next. Enter your address and we'll score delphinium ajacis against your land's real conditions.
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See Delphinium Ajacis
What Delphinium Ajacis is
Delphinium Ajacis grows as a perennial and reaches around five feet at maturity. It blooms blue in summer. It's also deer-resistant.
Life cycle, mature height, bloom period, flower colour and deer resistance: We haven't confirmed this against a published source yet.
How to grow Delphinium Ajacis
Delphinium Ajacis does best in full sun — at least 6 hours of direct sun a day — and soil from pH 6 to 7.5, on well-drained ground.
USDA Zones
Data pending
Soil pH
6 - 7.5
We haven't confirmed this against a published source yet.
Sun
Full Sun
We haven't confirmed this against a published source yet.
Drainage
well (dry spells)
We haven't confirmed this against a published source yet.
Mature Height
5 ft
We haven't confirmed this against a published source yet.
Start the season right
Plant delphinium ajacis in full sun with at least 6 hours of direct sun. It grows in the cool halves of the year, so sow it in spring or late summer rather than waiting for midsummer heat. We haven't confirmed this against a published source yet.
Match the soil
Delphinium Ajacis prefers pH 6 to 7.5. We haven't confirmed this against a published source yet. A quick soil test from your local Extension lab tells you whether to add lime or sulfur to land in band.
Water steadily
Keep the root zone evenly moist through establishment. We haven't confirmed this against a published source yet. A 2–3 inch mulch layer holds moisture without waterlogging.
Harvest at its peak
Cut delphinium ajacis blooms in the cool of the morning, just as they open, for the longest display.
Where Delphinium Ajacis thrives
Whether delphinium ajacis thrives on a given site comes down to its soil pH, drainage, sun, and frost dates — the conditions that vary parcel to parcel.
What grows around Delphinium Ajacis
Growing guides for delphinium ajacis
Related plants in perennial flower
Good to know
One caution for pet owners — delphinium ajacis is toxic to dogs, cats and horses (severe severity). Keep it out of reach, and call ASPCA Animal Poison Control at (888) 426-4435 in an emergency. We haven't confirmed this against a published source yet.
Delphinium Ajacis offers moderate value to bees and other pollinators. We haven't confirmed this against a published source yet.
Your land is one point inside Delphinium Ajacis's range
This page resolves to the species. Your state page draws the county line, and a report reads the parcel — the soil pH, drainage, sun, and frost dates on your exact ground, which no species average can see.
See if Delphinium Ajacis will thrive on your land
Zone averages are a start. Your soil pH, drainage, sun exposure, and frost dates shape whether delphinium ajacis actually takes. We score it against the mapped and modelled conditions at your address.
Three things about your exact spot that zone averages miss:
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
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How we know this about Delphinium Ajacis
The figures above are cited per row, not per site: the pH band names this plant’s own source column, the three temperature figures each carry their own, and days-to-maturity cites the publication that actually lists it. All of it comes from the Growable Ground Plant Database — a compilation over FAO ECOCROP, USDA PLANTS, and university Extension sources, published openly with per-field provenance.
Grounded inUSDA PLANTS Database
Frequently asked questions
Can I grow Delphinium Ajacis in my zone?
Delphinium Ajacis has no verified hardiness zone, so we do not state one. A Growable Ground report checks your parcel's frost dates, soil, and climate directly instead.
When should you plant Delphinium Ajacis?
Delphinium Ajacis is a cool-season crop, so it goes in during the cool halves of the year — early spring, and again in late summer for a fall planting — rather than at the height of summer heat. Your local frost dates set the exact window — a Growable Ground report reads them for your address.
How much sun does Delphinium Ajacis need?
Delphinium Ajacis needs full sun — a spot that catches at least 6 hours of direct summer sun a day. We haven't confirmed this against a published source yet. In more shade it still grows, but usually gives a smaller, later crop. The catch is that a yard rarely gets even light everywhere — a fence, the house, or one tall tree can quietly take those hours. A Growable Ground report reads the real sun-hours across your land, canopy and buildings included, so you can pick the brightest bed before you plant.
What soil does Delphinium Ajacis need?
Delphinium Ajacis prefers soil pH 6 to 7.5, on well-drained ground. We haven't confirmed this against a published source yet. Your report scores your parcel's mapped soil against that using USDA SSURGO data.
Does Delphinium Ajacis attract pollinators?
Yes — delphinium ajacis's flowers are a solid nectar source for native bees, butterflies, and hummingbirds. We haven't confirmed this against a published source yet.
Is Delphinium Ajacis safe for pets?
Delphinium Ajacis is toxic to dogs, cats and horses with severe severity. Keep it out of reach, and call ASPCA Animal Poison Control at (888) 426-4435 in an emergency. We haven't confirmed this against a published source yet.