The illustrated growing guide
Delphinium
Delphinium elatum
Family Ranunculaceae
Est. zones 3-7
The 6-foot blue exclamation point of English borders — and it demands English weather, rich food, and a stake. Zone 3-6 gardeners get the glory; hot-summer zones grow it as a splendid annual.
Full Sun
Moderate water
Fast in season growth
Deer-resistant
Attracts bees
From the print shop
Growing delphinium? Hang it.
Our Cottage Garden Vol. 2 collection carries delphinium — Delphinium elatum, print Nº 2, “Delphinium.”
16 designsfrom $21.99white or black groundmatte poster, unframed
I
Overview
Will delphinium suit your garden, and what goes wrong.
Will it fruit where you are?
Enter your ZIP — we look up your USDA hardiness zone (2023 map) and check it against what delphinium actually needs.
Hardy inZones 3-7Delphinium at a glance
Common delphinium problems
- Slugs (devour spring shoots)
- Aphids
- Powdery Mildew
- Crown Rot
- Black Blotch
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Growing
Light, water, soil, propagation and the season’s jobs.
How to grow delphinium: light, water & soil
How to plant & propagate delphinium
When to spray delphinium
Growing season. Slug patrol in April is the make-or-break.
III
The year
What delphinium asks for, month by month.
The delphinium year, month by month
BloomWhat each band means
- Bloom — flowers open — pollinators working, frost on blossoms is the danger.
The delphinium year as text
- Jan quiet month
- Feb quiet month
- Mar quiet month
- Apr quiet month
- May quiet month
- Jun bloom
- Jul quiet month
- Aug quiet month
- Sep bloom
- Oct quiet month
- Nov quiet month
- Dec quiet month
These are the species' typical months — expect them a few weeks earlier in warm zones and later in cold ones. Watch the plant, not just the calendar.
IV
Ecology & uses
What it does for the garden, and what it is grown for.
Delphinium in the garden system
- Herbaceous layer perennial
What delphinium is grown for
⚠ Toxic if eatenALL PARTS TOXIC — site away from grazing pets
Edibility, identification, and traditional-use notes here are general reference — not medical or veterinary advice, and not a claim that any plant treats or prevents anything. Medicinal ratings record how strongly a plant features in herbal tradition, nothing more. Never eat or dose a plant you have not positively identified. More on how to use this library.
V
Cultivars
Named varieties of delphinium, ruled as a catalogue.
Best delphinium varieties & cultivars
'Pacific Giants'; 'Magic Fountains' (shorter, self-supporting-ish); 'New Millennium' (modern vigor)
VI
Sources & plant ID
Where the care distinctions come from, and how the plant is filed.
Research basis
Sources behind this profile
No extension citations are attached to delphiniumyet. The care figures below come from the library's own catalogue rather than a traced primary source.
Plant ID
VII
Where to buy
Third-party nurseries — not Story Thyme Farms.
Third-party nurseries, not Story Thyme Farms. Prices are theirs.
Story Thyme Farms may earn a small commission from these links, at no cost to you — it never changes what we recommend.
VIII
Questions
Delphinium questions, answered straight.
Do deer eat delphinium?
Rarely — delphinium is considered deer-resistant, which makes it one of the safer unfenced choices in deer country. Hungry deer in a hard winter test every rule, but it's a low-risk pick.
Is delphinium safe for kids and pets?
No — treat it as toxic if eaten. ALL PARTS TOXIC — site away from grazing pets Site it accordingly if children or pets roam the garden. This is general reference, not medical or veterinary advice — call a vet or poison control if something has actually been eaten.
How do you propagate delphinium?
Division or seed.
IX
Elsewhere
Where delphinium sits in the library.
Sunflower
Zinnia
Peony
Daylily