North America Native Plant

Dimpled Troutlily

Botanical name: Erythronium umbilicatum monostolum

USDA symbol: ERUMM4

Life cycle: perennial

Habit: forb

Native status: Native to the lower 48 states  

Dimpled Troutlily: A Rare Southern Native for Your Woodland Garden Meet the dimpled troutlily (Erythronium umbilicatum monostolum), a charming spring ephemeral that’s as unique as its name suggests. This delightful native perennial brings early-season beauty to woodland gardens across its limited range in North Carolina and Tennessee. While you might ...

Rare plant alert!

Region: Conservation status by state

Status: S5T3: Status is uncertain but is somewhere between the following rankings: Subspecies or variety is vulnerable: Either very rare and local throughout its range, found only in a restricted range (even if abundant at some locations), or factors are making it vulnerable to extinction. Typically 21 to 100 occurrences or between 3,000 and 10,000 individuals. ⚘ Secure: At very low or no risk of extinction in the jurisdiction due to a very extensive range, abundant populations or occurrences, with little to no concern from declines or threats. ⚘

Dimpled Troutlily: A Rare Southern Native for Your Woodland Garden

Meet the dimpled troutlily (Erythronium umbilicatum monostolum), a charming spring ephemeral that’s as unique as its name suggests. This delightful native perennial brings early-season beauty to woodland gardens across its limited range in North Carolina and Tennessee. While you might not find this particular troutlily at your local nursery, it’s worth seeking out for gardeners who love rare native plants and want to support regional biodiversity.

What Makes the Dimpled Troutlily Special?

The dimpled troutlily belongs to the beloved troutlily family, known for their nodding, lily-like flowers and distinctively mottled leaves that resemble the markings on a trout’s back. As a native forb, this perennial lacks woody stems but packs plenty of charm into its herbaceous form. True to its troutlily heritage, this species likely emerges in early spring before the forest canopy leafs out, making the most of available sunlight.

Where You’ll Find It Growing Wild

This special troutlily calls the southeastern United States home, specifically thriving in North Carolina and Tennessee. Its limited geographic distribution makes it a true regional treasure for native plant enthusiasts in these areas.

A Word About Rarity

Before you start planning your dimpled troutlily patch, there’s something important to know: this species has a Global Conservation Status of S5T3, indicating it’s considered rare in its natural habitat. This doesn’t mean you can’t grow it, but it does mean you should be extra thoughtful about sourcing. Always purchase from reputable native plant nurseries that propagate their plants rather than wild-collect them. Never dig plants from the wild!

Why Grow Dimpled Troutlily?

Here’s why this native beauty deserves a spot in your garden:

  • Early spring color: Provides blooms when little else is flowering
  • Native plant support: Supports local ecosystems and wildlife
  • Low maintenance: Once established, requires minimal care
  • Woodland charm: Perfect for naturalizing in shade gardens
  • Conservation value: Helps preserve a rare native species

Perfect Garden Companions

The dimpled troutlily shines in woodland settings and shade gardens where it can mimic its natural forest habitat. Plant it alongside other native spring ephemerals like bloodroot, wild ginger, and native ferns. It’s ideal for:

  • Woodland gardens
  • Native plant gardens
  • Naturalized areas under mature trees
  • Shade borders with other spring bloomers

Growing Conditions and Care

Like most troutlilies, the dimpled variety likely prefers the dappled shade and rich, moist soils found in its native woodland habitats. Here’s what to provide:

  • Light: Partial to full shade
  • Soil: Rich, well-draining woodland soil with plenty of organic matter
  • Moisture: Consistently moist during growing season, can tolerate some summer dryness when dormant
  • Hardiness: Likely hardy in USDA zones 5-8 based on its native range

Planting and Care Tips

Success with dimpled troutlily starts with mimicking its natural environment:

  • Plant bulbs in fall, 3-4 inches deep
  • Amend soil with compost or leaf mold to improve drainage and fertility
  • Mulch with shredded leaves to retain moisture and suppress weeds
  • Allow foliage to die back naturally – the plant needs this time to store energy
  • Be patient – troutlilies can take several years to establish and bloom reliably
  • Avoid disturbing the area during summer dormancy

Wildlife and Pollinator Benefits

As an early-blooming native, the dimpled troutlily likely provides valuable nectar for native bees, flies, and other pollinators when few other flowers are available. Its early emergence makes it especially important for supporting wildlife during the crucial spring season.

The Bottom Line

The dimpled troutlily is a wonderful choice for gardeners who appreciate rare native plants and want to contribute to conservation efforts. While it may take some extra effort to source responsibly, the reward of growing this southeastern treasure in your woodland garden is worth it. Just remember to be patient, provide the right growing conditions, and always purchase from ethical suppliers who propagate rather than wild-collect their plants.

By choosing native species like the dimpled troutlily, you’re not just creating a beautiful garden – you’re helping preserve regional biodiversity for future generations to enjoy.

Dimpled Troutlily

Classification

Group

Monocot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Liliopsida - Monocotyledons

Subclass

Liliidae

Order

Liliales

Family

Liliaceae Juss. - Lily family

Genus

Erythronium L. - fawnlily

Species

Erythronium umbilicatum Parks & Hardin - dimpled troutlily

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