Purple Giant Hyssop | Agastache scrophulariifolia

The name doesn't lie. Purple giant hyssop is genuinely giant — up to 6 feet of upright, diamond-stemmed presence topped with dense lavender-purple flower spikes that bloom late summer into fall when the rest of the garden is winding down. It's a late-season pollinator anchor: bees, butterflies (up to 14 documented species), hummingbirds, and songbirds that follow for the seeds. It's a cousin to the more familiar anise hyssop but taller, more architectural, and with a subtler spicy-herbal fragrance rather than licorice — closer to oregano than anise. The flower spikes also make excellent cut and dried flowers, and the seeds self-sow reliably for a self-sustaining colony over time.

Indigenous peoples of eastern North America used the leaves for respiratory support, fevers, and digestive complaints, and root infusions as a diuretic. The leaves can be used fresh in salads or dried for tea. It's not the medicinal heavy-hitter that some of its relatives are, but it earns its place in any food forest edge, back border, or pollinator corridor on sheer ecological output alone — and that stature makes a statement.

Latin Name: Agastache scrophulariifolia 

Light: Full sun to part shade 

Soil: Well-drained, average to sandy loam; adaptable; tolerates lean ground 

Water: Moderate; drought-tolerant once established 

Mature Size: 4–6 ft tall 

Bloom Time: Late summer through fall 

Hardiness Zone: 4–8 

Wildlife Value: Attracts bees, honeybees, 14+ butterfly species, hummingbirds; seeds feed songbirds; deer and rabbit resistant 

Edible/Medicinal: Young leaves used in salads and tea; traditionally used for respiratory complaints, fever, digestion, and as a diuretic; essential oils in flowers and foliage

Permaculture Value: Late-season pollinator anchor; self-seeding; excellent cut and dried flower; tall structural plant for food forest edges and back borders