North America Native Plant

Whitemouth Dayflower

Botanical name: Commelina erecta

USDA symbol: COER

Life cycle: perennial

Habit: forb

Native status: Native to the lower 48 states âš˜ Native to Puerto Rico âš˜ Native to the U.S. Virgin Islands  

Whitemouth Dayflower: A Charming Native Groundcover for Your Garden Looking for a native plant that’s both beautiful and easy to grow? Meet the whitemouth dayflower (Commelina erecta), a delightful perennial that’s been quietly beautifying North American landscapes for centuries. This unassuming little wildflower might just be the perfect addition to ...

Whitemouth Dayflower: A Charming Native Groundcover for Your Garden

Looking for a native plant that’s both beautiful and easy to grow? Meet the whitemouth dayflower (Commelina erecta), a delightful perennial that’s been quietly beautifying North American landscapes for centuries. This unassuming little wildflower might just be the perfect addition to your native garden.

What Makes Whitemouth Dayflower Special?

The whitemouth dayflower is a charming forb – that’s garden-speak for a non-woody plant that dies back to the ground each winter but returns reliably each spring. What sets this little beauty apart are its distinctive three-petaled flowers: two bright blue petals sitting atop a smaller white petal that gives the plant its whitemouth nickname. The flowers emerge from boat-shaped bracts and typically open in the morning, closing by afternoon – hence the dayflower part of its name.

The plant’s heart-shaped leaves create an attractive backdrop for the blooms, and its low-growing, spreading habit makes it excellent for naturalized areas and woodland gardens.

Where Does It Call Home?

This adaptable native has quite the range! Whitemouth dayflower is indigenous to most of the lower 48 states, Puerto Rico, and the U.S. Virgin Islands. You’ll find it naturally growing everywhere from Alabama to Wyoming, making it one of our continent’s most widespread native wildflowers. Its natural range spans multiple regions including the Great Plains, Eastern Mountains, Atlantic Coast, and beyond.

Garden Role and Design Ideas

Whitemouth dayflower shines as a groundcover in naturalized gardens, woodland settings, and native plant landscapes. Its spreading habit and attractive foliage make it perfect for:

  • Understory plantings beneath trees
  • Wildflower meadows and prairies
  • Low-maintenance landscape areas
  • Native plant gardens
  • Areas where you want seasonal color without high maintenance

Growing Conditions and Care

Here’s where whitemouth dayflower really wins hearts – it’s incredibly adaptable! This resilient native thrives in USDA hardiness zones 4-10, meaning it can handle everything from chilly northern winters to hot southern summers.

The plant shows remarkable flexibility when it comes to moisture conditions. Depending on your region, it can handle both wetland and upland conditions, though in most areas it prefers well-draining soil. In the northern parts of its range, it tends to prefer drier upland sites, while in other regions it’s happy in a wider range of moisture conditions.

For best results, plant whitemouth dayflower in partial shade to full sun. Once established, it’s quite drought tolerant, making it perfect for low-water gardens.

Planting and Maintenance Tips

Good news for busy gardeners – whitemouth dayflower is refreshingly low-maintenance! Here’s what you need to know:

  • Plant in spring after the last frost
  • Space plants 12-18 inches apart to allow for natural spreading
  • Water regularly the first season to establish roots
  • Once established, it’s quite drought tolerant
  • The plant spreads via underground rhizomes, so give it room to naturalize
  • It may also self-seed in favorable conditions
  • Minimal fertilization needed – it’s adapted to average soils

Wildlife and Pollinator Benefits

Your local wildlife will thank you for planting whitemouth dayflower! According to research, this native provides 10-25% of the diet for large animals in some regions, and 5-10% for terrestrial birds. The morning flowers attract small pollinators including native bees and flies, supporting the intricate web of life in your garden.

Large animals occasionally use the plant for cover, making it a valuable addition to wildlife-friendly landscapes.

Is Whitemouth Dayflower Right for Your Garden?

If you’re looking for a native plant that’s beautiful, low-maintenance, and beneficial to wildlife, whitemouth dayflower deserves serious consideration. It’s perfect for gardeners who want to support native ecosystems without spending every weekend doing garden chores.

Keep in mind that this plant has a spreading habit, so it’s ideal for naturalized areas rather than formal flower beds. If you love the idea of a garden that takes care of itself while supporting local wildlife, whitemouth dayflower might just become one of your favorite discoveries.

With its charming morning blooms, attractive foliage, and easy-going nature, whitemouth dayflower proves that sometimes the most unassuming plants make the biggest impact in creating a thriving, sustainable garden.

Wildlife Status

Want to attract wildlife or keep hungry critters away from your garden? Understanding the relationship between plants and wildlife is key. While plant tags may indicate deer and rabbit resistance, they don't tell the full story. Every gardener has experienced the disappointment of purchasing "deer-resistant" plants only to find them nibbled to the ground!

The extent to which plants are resistant to animal browsing is a matter of degree. Likewise, the extent to which a plant attracts wanted visitors also varies. Whether you want a garden full or free of wildlife, learning about interactions between a plant and wild animals can help you make smarter choices for the garden you desire.

As shown below Shrubby Indian Mallow isn't a large food source for animals or birds. You can confidently add this plant to your garden and rest assured knowing it's unlikely to be devoured by four-legged visitors.

Small animals

not a food source

not a source of cover

Large animals

Average 10-25% of diet

Occasional source of cover

Terrestrial birds

5-10% of diet

Infrequently used as cover

Water birds

not a food source

not a source of cover

Sources:

Everitt, J.H., D.L. Drawe, and R.I. Lonard. 1999. Field guide to the broad leaved herbaceous plants of South Texas used by livestock and wildlife. Texas Tech University Press. Lubbock.

Whitemouth Dayflower

Classification

Group

Monocot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Liliopsida - Monocotyledons

Subclass

Commelinidae

Order

Commelinales

Family

Commelinaceae Mirb. - Spiderwort family

Genus

Commelina L. - dayflower

Species

Commelina erecta L. - whitemouth dayflower

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