North America Non-native Plant

Hound’s Tongue

Botanical name: Cynoglossum

USDA symbol: CYNOG

Life cycle: biennial

Habit: forb

Native status: It's either native or not native in Canada âš˜ Non-native, reproduces and persists in the wild in Hawaii âš˜ It's either native or not native in the lower 48 states âš˜ Non-native, reproduces and persists in the wild in Puerto Rico  

Hound’s Tongue: A Hardy Wildflower with Old-World Charm If you’re looking for a low-maintenance wildflower that brings a touch of cottage garden romance to your landscape, hound’s tongue (Cynoglossum) might just catch your eye. This unassuming herbaceous plant has been quietly making its way across North America, earning both admirers ...

Hound’s Tongue: A Hardy Wildflower with Old-World Charm

If you’re looking for a low-maintenance wildflower that brings a touch of cottage garden romance to your landscape, hound’s tongue (Cynoglossum) might just catch your eye. This unassuming herbaceous plant has been quietly making its way across North America, earning both admirers and skeptics along the way.

What is Hound’s Tongue?

Hound’s tongue is a biennial or perennial forb that belongs to the borage family. Despite its somewhat unflattering common name (which refers to the shape and texture of its leaves), this plant produces clusters of small, charming flowers in shades of blue, purple, or occasionally white. The entire plant has a soft, hairy texture that gives it a distinctive gray-green appearance.

As a forb, hound’s tongue lacks the woody stems of shrubs and trees, instead growing as an herbaceous plant that typically reaches 1 to 4 feet in height and spreads about 1 to 2 feet wide. Its growth rate is moderate, and it has a tendency to self-seed readily once established.

Where Does Hound’s Tongue Grow?

Originally native to Eurasia and Mediterranean regions, hound’s tongue has naturalized across an impressive range in North America. You can find it growing in states and provinces from Alberta to Puerto Rico, including most of the continental United States and much of Canada. It’s particularly well-established in areas with disturbed soils, roadsides, and open meadows.

Native Status: What Gardeners Should Know

Here’s where things get a bit complicated. Hound’s tongue has a mixed native status across North America:

  • In Hawaii and Puerto Rico, it’s classified as non-native but naturalized
  • In Canada and most U.S. states, its status is less clearly defined
  • While widespread, it’s not currently listed as invasive in most areas

This ambiguous status means gardeners should use their best judgment. If you’re committed to growing only native plants, you might want to explore indigenous alternatives that provide similar benefits to your local ecosystem.

Garden Design and Landscape Use

Hound’s tongue shines in informal, naturalistic settings where its wild character can be appreciated. It’s perfect for:

  • Wildflower meadows and prairie gardens
  • Cottage garden borders
  • Areas with poor or disturbed soil
  • Low-maintenance landscape areas
  • Pollinator gardens

The plant’s soft blue flowers create lovely combinations with other wildflowers, and its ability to thrive in challenging conditions makes it valuable for difficult spots in the landscape.

Pollinator and Wildlife Benefits

One of hound’s tongue’s strongest selling points is its appeal to pollinators. The small flowers are rich in nectar and attract various bees, butterflies, and other beneficial insects. This makes it a valuable addition to pollinator gardens, especially in areas where few other plants are willing to grow.

Growing Conditions and Care

Hound’s tongue is refreshingly undemanding when it comes to growing conditions:

  • Soil: Adapts to various soil types, including poor, rocky, or disturbed soils
  • Drainage: Prefers well-draining soil but tolerates some moisture variation
  • Light: Grows well in full sun to partial shade
  • USDA Hardiness Zones: Generally hardy in zones 3-9
  • Water: Drought tolerant once established, minimal watering needed

Planting and Care Tips

Growing hound’s tongue is almost embarrassingly easy:

  • Direct sow seeds in fall or early spring
  • Barely cover seeds, as they need light to germinate
  • Space plants about 12-18 inches apart
  • Water regularly until established, then reduce watering
  • No fertilization needed – it actually prefers lean soils
  • Deadhead flowers to prevent excessive self-seeding if desired
  • Allow some plants to go to seed for natural propagation

The Bottom Line: Should You Grow Hound’s Tongue?

Hound’s tongue can be a valuable addition to the right garden, especially if you’re looking for a low-maintenance plant that supports pollinators and thrives in challenging conditions. However, its enthusiastic self-seeding habit and non-native status in some areas mean it’s worth considering carefully.

If you decide to grow it, keep an eye on its spread and consider pairing it with native wildflowers that provide similar benefits. And if you’re passionate about supporting local ecosystems, research native alternatives in your area that might fill the same niche in your garden design.

Whatever you choose, remember that the best garden is one that brings you joy while being mindful of the broader ecological community we all share.

Hound’s Tongue

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Asteridae

Order

Lamiales

Family

Boraginaceae Juss. - Borage family

Genus

Cynoglossum L. - hound's tongue

Species

Plant data source: USDA, NRCS 2025. The PLANTS Database. https://plants.usda.gov,. 2/25/2025. National Plant Data Team, Greensboro, NC USA