Notice: We do not accept seeds that were given before 2025 as they had hybridized with Korean mint.
Image of Agastache scrophulariifolia
Source: OWSL
image of Flowering plant
Agastache scrophulariifolia
Purple Giant Hyssop
Agastache à feuilles de scrofulaire

Obsolete Names

figwort giant-hyssop
No seeds available for this plant.
We currently accept seeds for this plant
Bloom colour: Purple Bloom period: Jul - Oct
Max Height: 6.0 feet
Max Width: 2.0 feet (spreads by rhizome)
Light condition:
Full sun More than 6 hours of direct sun a day
Part shade More than 2 or 3 hours but less than 6 hours of direct sun a day
Soil conditions:
Moisture medium Tolerates medium soil condition
Lifespan: Perennial plants that will that come back year after year
Gardener Experience:
beginner friendly Suitable for beginner gardeners
plant germinate easy Easy to germinate
plant self seeding Self-seeding
Landscape uses:
container suitable Suitable for container garden
school garden Suitable for school gardens
Ecological Benefits:
Hummingbird friendly Supports hummingbirds
Bird friendly Supports birds
butterfly host Butterfly host
Tolerates:
drought Tolerant Tolerates drought conditions
Deer Resistant Deer resistant
rabbit resistant Rabbit resistant
limestone Tolerant Tolerates limestone conditions
transplantation Tolerant Tolerates transplantation
Special Features and Considerations:
plant endangered This plant is endangered
septic tank safe This plant is septic tank safe

Plant Location

Native to Ottawa region: No

Distribution according to VASCAN

Distribution: Agastache scrophulariifolia
Ephemeral Native Introduced Excluded Extirpated Doubtful Absent
View taxonomy on Canadensys

View on iNaturalist

Thrives in Ecozones

  • Mixed Wood Plains

Ecological Benefits

Butterflies Supported by Agastache scrophulariifolia

No butterfly data available for this plant.

Specialized Bees Supported by Agastache scrophulariifolia

No bee data available for this plant.

Plants that grow in similar conditions, that bloom at the same time.

Complementary Plants

Substitute For Non-Native Plants

  • Perovskia Atriplicifolia (Russian Sage)
  • Lupinus (Non-Native Lupins)
  • Ajuga reptans (Bugleweed)
  • Buddleia (Butterfly Bush)
  • Delphinium (Delphinium)
  • Salvia (Non-Native Sage)
  • Lavandula) (Lavender)

Sowing Information

Download Sowing Label (PDF)
  • Sowing depth: Surface sow
  • Sow by February
  • Stratification duration: 60 days
  • Self-seeding

Harvesting and Seed Sharing

  • Harvest start month: October
  • Harvesting indicator: Pods are brown and crisp and starting to open, seeds are dark and tiny stem attaching to the main stem is brown. Seeds easily fall off pod when shaken, and little stem connecting the pod to the main stem is brown (not green)
  • Harvesting mean: Put pods in food processor or blender and blend seeds, and strain seeds using a strainer
  • Seed viability test: No test needed before donating
  • Packaging measure: Half of one, 1/32 teaspoon
  • Seed storage: Air dry in paper bag or open container, for a few days until crisp, shaking seeds to move them once in a while to prevent molding
  • At least one cultivar: Yes, do not donate unless you know source, and there are no known cultivars in your garden or at proximity
  • No harvesting video available at this time.

Toxicity Notes

Can cause cats indigestion.