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Agastache nepetoides
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  • Agastache nepetoides
  • Agastache nepetoides
  • Agastache nepetoides
  • Agastache nepetoides
Agastache nepetoides

Agastache nepetoides

Yellow Giant Hyssop
AGASTACHE (Lamiaceae) hyssop

Agastache are upright, aromatic perennials grown for their narrow flower spikes and long summer flowering. Foliage is textured and scented, with notes that vary from mint to anise depending on species. Plants prefer full sun and freely draining soil, where warmth and lean conditions encourage sturdy stems and dense growth. Many forms are drought tolerant once established, though those of cooler origin accept a little more moisture. Flowers are highly attractive to bees, butterflies, and other generalist pollinators.

Clumps can be lifted and divided in spring to maintain vigour. Removing spent spikes can extend the flowering season, though old stems may also be left standing for winter texture. Agastache work well in mixed borders, meadow-style plantings, and gravel gardens where a light vertical structure and reliable mid-season colour are needed.

A tall, narrow hyssop with a remarkably upright, little-branched habit that brings a clean vertical line to late-summer plantings. The flowers sit toward the green end of yellow and aren’t especially showy, though that seems to matter little to insects, which work the spikes steadily through the season. Much of the plant’s character emerges late in the year as the stems dry and darken, creating sharp, pitch-black spikes that hold their shape into winter and offer small birds a modest supply of seed.

The overall effect is architectural rather than floral, pairing well with late perennials and grasses where its lean profile adds quiet tension and height.
Pot size
$10.00
Out of stock
Growing Conditions

Light: full sun to light shade

Moisture: average to moist

Soil: well drained; accepts average soils

Hardiness zone: 4

Maintenance: low; may self-seed modestly; dried spikes may be left for winter structure and bird forage
Size & Habit

Height (cm): 180

Spread (cm): 20

Habit: tall, upright clump
Seasonal Interest

Flowering period: July–Sept

Seasonal interest: late-summer bloom; dramatic black seed spikes through winter

Foliage: medium green

Flower: green-yellow
Ecology & Notes

Wildlife value: visited by bees; winter seedheads feed small birds

Deer/Rabbit resistance: yes

Habitat: meadows; naturalistic borders; prairie-style plantings; wildlife gardens

Features: tall, narrow habit; late-season structure; persistent black seed spikes; NA native

Notes: valued for form over colour; strong vertical accent; excellent with grasses and late perennials

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