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Agastache foeniculum

Anise Hyssop

FIRST IMPRESSIONS:  Agastache foeniculum is an upright perennial with light green angular stems.  Plants are clothed in lovely anise scented leaves. In summer, lavender to purple flower spikes draw a crowd of bees, butterflies and other pollinators.  Plants thrive in sunny well drained sites.

HABITAT & HARDINESSAgastache foeniculum is native to most of the southern Canadian provinces and the Northwest Territory.  The species occurs in Connecticut, New York, New Hampshire, New Jersey, Pennsylvania, Kentucky and from Michigan to Montana south to Illinois, Colorado and Wyoming.

Typical habitats included upland sections of prairies, shrubby barrens, dry upland woods and thickets.

Plants are hardy in USDA Zones 4-8.

PLANT DESCRIPTION:  This mounding warm season perennial bears attractive pubescent licorice scented leaves.  

Blades are heart shaped or broadly lanceolate with rounded teeth.  They are opposite with short petioles and are reminiscent of catnip or catmint.  The surface is a soft gray-green and undersides are covered in pale silvery hairs.

Loads of spikey lavender to blue-violet flowers emerge in summer. The spikes are 3-6” long and are densely packed with small tubular florets. 

The florets have purplish calyxes which extends the season of color. Blooming continues for about two months before the florets are replaced by smooth oval nutlets.  

Plants are 2-4’ tall with a 2-3’ spread.

CULTURAL & MAINTENANCE NEEDS:  Agastache foeniculum favors a sunny site with well drained sandy loam soil.  Plants will tolerate drought, light shade, clay-loam or gravelly soils and acid or alkaline pH.

The most important cultural need for this plant is good drainage. Heavy layers of mulch can hold too much water so plants should be mulched lightly or not at all. If drainage is not good, plants are likely to succumb to winter injury.

Flowering will continue for longer periods if plants are dead-headed.

Plants are pest resistant and the aromatic foliage makes shoots unpalatable to deer and rabbits.

LANDSCAPE USES: Agastache foeniculum is a wonderful Accent when covered with bottlebrush blossoms and a cloud of butterflies.  It is at home in Herb Gardens or Perennial Borders and is used as a Butterfly Nectar Plant or as part of a Grouping or Mass Planting.  Plants provide Fragrance, Showy Blooms, Cut Flowers and are valuable components of Cottage Gardens, Water-wise Landscapes, Low Maintenance Plantings and Wildlife Gardens.

COMPANION & UNDERSTUDY PLANTS:  Agastache foeniculum mingles nicely with Callirhoe involucrata, Coreopsis verticillata ‘Moonbeam’, Echinacea purpurea, Rudbeckia fulgida var. fulgida or Solidago nemoralis.  Blue tinged grasses like Panicum amarum ‘Dewey Blue’ or Schizachyrium scoparium ‘Standing Ovation’ provide a nice contrast.

If a substitute is needed, Scutellaria incana could be a good choice.

TRIVIA:  Like most aromatic herbs this plant is a member of the Mint Family (Lamiaceae).  The genus name Agastache is Greek for “many spikes”.  The specific epithet is from a Latin word that means “hay”.

Flowers are pollinated primarily by various types of bees including honeybees, bumblebees, Halictid bees, digger bees, leaf-cutting bees and masked bees.  Flowers are also visited by pollinating flies, butterflies, skippers, moths and the occasional hummingbird.  Due to the aromatic foliage, plants are not palatable to deer and other herbivores. 

The aromatic leaves can be harvested and used to make herbal teas or jellies.


Height:

2-4 ft

Spread:

2-3 ft

USDA Hardiness Zone:

4-8

Bloom Color:

Lavender

Agastache foeniculum Characteristics

Exposure

  • Full Sun to Partial Shade

Critter Resistance

  • Deer Resistant

Attracts Wildlife

  • Pollinators
  • Hummingbirds
  • Butterflies

Soil Moisture Preference

  • Dry to Moist

Attributes

  • Fragrant
  • East-Coast Native
  • Drought Tolerant
  • Naturalizing
  • Interesting Foliage

Flowering Months

  • September
  • August
  • July

Foliage Color

  • Green

Season of Interest (Foliage)

  • Summer
  • Spring

Growth Rate

  • Medium

Salt Tolerance

  • Medium

Plants that work well with Agastache foeniculum ''

White coneflower White coneflower (Echinacea purpurea 'White Swan')
Thread leaf tickseed Thread leaf tickseed (Coreopsis verticillata)
Black-eyed Susan Black-eyed Susan (Rudbeckia fulgida v. fulgida)
Prairie goldenrod Prairie goldenrod (Solidago nemoralis)
Atlantic coastal panic grass Atlantic coastal panic grass (Panicum amarum 'Dewey Blue')
Little bluestem Little bluestem (Schizachyrium scoparium)
Grey-Headed Coneflower Grey-Headed Coneflower (Ratibida pinnata)

Substitutions for Agastache foeniculum

hoary skull cap hoary skull cap (Scutellaria incana)