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yellow giant hyssop

Scientific Name: Agastache nepetoides

Family: Lamiaceae

Category: Dicot

Growth: Subshrub, Forb/herb

Duration: Perennial

Other Names: CT (yellow giant hyssop), NY (yellow giant-hyssop)

       

Yellow Giant Hyssop (Agastache nepetoides)

The Yellow Giant Hyssop, scientifically known as Agastache nepetoides, is a robust perennial with distinctive greenish-yellow flowers. It's a striking addition to any garden, attracting various pollinators.

Common Names

  • Yellow Giant Hyssop
  • Catnip Giant Hyssop

Taxonomy and Nomenclature

  • Scientific Name: Agastache nepetoides (L.) Kuntze
  • Family: Lamiaceae (Mint Family)
  • Group: Dicot
  • Growth Habit: Subshrub Forb/herb
  • Synonyms: Hyssopus nepetoides, Lophanthus

Considerations for Pets

  • The plant has a sharply f-sided stem
  • The plant has seeds that may cause digestive distress.

Morphology and Growth

  • Herbaceous perennial
  • Grows to a height of 4-7 feet (1.2-2.1 meters)
  • Spread of 1-3 feet (0.3-0.9 meters)
  • Little branched, except for stems from middle to upper leaf axils
  • Stout, square stems
  • Ovate, toothed, dark green leaves
  • Dense, cylindrical flower spikes up to 8 inches long with 1/3-inch greenish to yellow tubular flowers

Distribution and Habitat

  • Native to the central prairie regions of the United States and Canada
  • Found in southern Canada and the southeastern United States
  • Prefers part shade to partial sun and moist to medium water conditions
  • Hardiness Zones: 2-8

Ecological Role

  • Attracts wildlife
  • Rated as an imperiled species in some regions
  • State Threatened species in some areas

Quirky Facts

  • Despite its name and appearance, Yellow Giant Hyssop is not the true hyssop (Hyssopus officinalis) and lacks its characteristic minty fragrance.
  • The flower spikes are described as resembling "a miniature choir of cacti."

Bloom Time

  • July
  • August
  • September

Interactions with Other Organisms

  • Attracts pollinators such as bumble bees and Eastern Tiger Swallowtails

Additional Resources

  • RHS (Royal Horticultural Society)
  • Endangered Resces Program
  • Dave's Garden
  • Toadshade Wildflower Farm (mail order nursery in Frenchtown, NJ)
  • Discover Life
  • Wolfram|Alpha