The illustrated growing guide
Blue Vervain
Verbena hastata
Family Verbenaceae
Est. zones 3-8
An elegant native for wet spots — airy candelabras of violet-blue flowers over weeks in midsummer, feeding bees and butterflies and setting seed for goldfinches. A rain-garden and moist-meadow staple that self-sows politely and weaves beautifully among Joe Pye and swamp milkweed. Also a long-standing folk tonic herb. Refined, well-behaved, and ecologically rich.
Full Sun to Part Shade
Moderate water
Fast growth
Native to North America
Attracts butterflies
Attracts bees
From the print shop
Growing blue vervain? Hang it.
Our Wildflowers Vol. 2 collection carries blue vervain — Verbena hastata, print Nº 11, “Blue Vervain.”
16 designsfrom $21.99white or black groundmatte poster, unframed
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Overview
Will blue vervain 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 blue vervain actually needs.
Hardy inZones 3-8Blue Vervain at a glance
Common blue vervain problems
- Almost none
- Powdery Mildew (minor)
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Growing
Light, water, soil, propagation and the season’s jobs.
How to grow blue vervain: light, water & soil
How to plant & propagate blue vervain
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The year
What blue vervain asks for, month by month.
The blue vervain year, month by month
BloomPruneWhat each band means
- Bloom — flowers open — pollinators working, frost on blossoms is the danger.
- Prune — shape it now — cuts heal cleanly and structure is visible.
The blue vervain year as text
- Jan pruning
- Feb pruning
- Mar pruning
- Apr pruning
- May pruning
- Jun quiet month
- Jul bloom
- Aug quiet month
- Sep quiet month
- Oct quiet month
- Nov quiet month
- Dec pruning
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.
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Ecology & uses
What it does for the garden, and what it is grown for.
Blue Vervain in the garden system
- Herbaceous layer perennial
- Nectary/insectary
What blue vervain is grown for
✓ Commonly eatenLeaves used in traditional bitter tea — culinary caution; grown mainly as a native pollinator plant
Harvesting & storing blue vervain
Leaves a traditional medicinal (bitter tonic tea).
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.
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Cultivars
Named varieties of blue vervain, ruled as a catalogue.
Best blue vervain varieties & cultivars
Species; V. stricta (hoary vervain, drier sites)
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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 blue vervainyet. The care figures below come from the library's own catalogue rather than a traced primary source.
Plant ID
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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.
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Questions
Blue Vervain questions, answered straight.
Is blue vervain safe for kids and pets?
Blue Vervain is commonly eaten and isn't considered toxic, but "commonly eaten" isn't a guarantee for any particular person or animal — allergies, quantity, and which part you eat all matter. One caveat on this one: Leaves used in traditional bitter tea — culinary caution; grown mainly as a native pollinator plant. Never eat a plant you haven't positively identified, and check with a vet before letting pets or livestock graze anything new.
When do you harvest blue vervain?
Leaves a traditional medicinal (bitter tonic tea).
How do you propagate blue vervain?
Division or seed.
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Elsewhere
Where blue vervain sits in the library.
Common Milkweed
Ironweed
Cup Plant
Helen's Flower (Sneezeweed)