Western Giant Hyssop

Agastache occidentalis

Native to:
United States

📍 View on iNaturalist →

Taxonomy

Division:
Magnoliophyta | - Flowering plants
Family:
Lamiaceae
Genus:
Agastache
Species:
Agastache occidentalis
USDA Symbol:
AGOC

Growth Characteristics

Life Cycle:
Perennial
Growth Habit:
Forb/herb , Subshrub
Height:
100 cm
Light Requirements:
Full Sun
Drought Tolerance:
Medium
Bloom Months:
jun,jul,aug,sep
Bloom Colors:
pink, purple, magenta

Wildlife Benefits

Bees:
★☆☆☆☆ Documented bee visitation (GBIF)
Butterflies & Moths:
★☆☆☆☆ Documented Lepidoptera association (GBIF)

Reported Fauna Sightings

Bees: Central bumble bee (Bombus centralis), van Dyke bumble bee (Bombus vandykei), Yellow bumble bee (Bombus fervidus)

Garden & Ecology Notes

Wildlife Value:
bees, hummingbirds, butterflies
Deer Resistant:
Yes
Fragrant:
Yes
Fire Ecology:
Fire adapted — tolerates or benefits from fire
Fire Notes:
Resprouts vigorously from root crown after fire. Common in post-fire meadow communities in montane western habitats.

Soil Requirements

Soil Type:
well-drained, sandy or rocky soil
pH:
6.0 - 7.5 (slightly acidic to neutral)
Drainage:
excellent drainage required
Moisture:
dry to moderate
Notes:
native to dry, open slopes and ridges

Propagation & Germination

Stratification:
Cold/moist stratification required — 30–60 days
Germination Time:
14–30 days
Notes:
Seeds require light for germination; surface sow or barely cover. Best germination at 18-21°C.

The above propagation data sourced from Claude AI

Pre-treatment: Single-step cold-moist stratification for temperate woodland species. for 60–120 days

Source: Claude AI

ORGHPS Germination Guide: Most interbreed and seed may not be what is labelled

Source: Ontario Rock Garden & Hardy Plant Society