Blue Vervain is a perennial grown for its blooms, which open in summer and return year after year. Notably, it shrugs off deer. Its summer flowers are a real draw for honeybees, native bees, butterflies, and hummingbirds.
Zones
Data not available
pH Range
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Sun
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Days to Maturity
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Score Blue Vervain on your exact land.
Zone averages can't see the slope, soil, frost, and sun that decide whether blue vervain actually takes — and those shift from one yard to the next. Enter your address and we'll score blue vervain against your land's real conditions.
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What Blue Vervain is
Blue Vervain grows as a perennial and reaches around five feet at maturity. It blooms in summer. It's also deer-resistant.
How to grow Blue Vervain
USDA Zones
Data not available
USDA PHZM 2023
Soil pH
Data pending
USDA PLANTS Database
Sun
Data pending
plant_species_v5.csv
Drainage
Data pending
plant_species_v5.csv
Mature Height
5 ft
plant_species_v5.csv
Frost-Free Days
0+
plant_species_v5.csv
Start the season right
Plant blue vervain in full sun, once the soil has warmed and frost risk has passed.
Match the soil
Pull a soil test from your local Extension lab to confirm pH and drainage match blue vervain's needs before planting.
Water steadily
Keep the root zone evenly moist through establishment. Match watering to the plant's drainage preference and your local rainfall.
Harvest at its peak
Cut blue vervain blooms in the cool of the morning, just as they open, for the longest display.
Good to know
Good news for pet owners — blue vervain isn't known to be toxic to dogs or cats. (Source: ASPCA.)
Blue Vervain is a standout pollinator plant — high value to bees and other pollinators. (Source: Xerces Society, Pollinator Partnership.)
Where Blue Vervain thrives
Whether blue vervain thrives on a given site comes down to its soil pH, drainage, sun, and frost dates — the conditions that vary parcel to parcel.
See if Blue Vervain will thrive on your land
Zone averages are a start. Your exact soil pH, drainage, sun exposure, and frost dates shape whether blue vervain actually takes — we score it against the real conditions at your address.
Three things about your exact spot that zone averages miss:
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Frequently Asked Questions
Can I grow Blue Vervain in my zone?
Zone data for blue vervain is being finalized. A Growable Ground report checks your parcel's full suitability against federal soil, climate, and zone data.
When should you plant Blue Vervain?
Most growers plant blue vervain after the last spring frost, once the soil has warmed. Your local frost dates set the exact window — a Growable Ground report reads them for your address.
What soil does Blue Vervain need?
Specific pH data for blue vervain is pending. A soil test from your local Extension lab confirms what your site needs.
Does Blue Vervain attract pollinators?
Yes — blue vervain's flowers are a strong nectar and pollen source for honeybees, native bees, butterflies, and hummingbirds (Xerces Society, Pollinator Partnership).
Is Blue Vervain safe for pets?
Blue Vervain is not known to be toxic to dogs or cats based on available data (ASPCA). Always supervise pets around new plantings.