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Plant care

Dimpled Trout Lily (Trout Lily) care

Erythronium umbilicatum

Also called Dimpled Trout Lily, Trout Lily, Southeastern Fawn Lily.

RHS H6USDA 4-9Mildly toxic to petsIndoor 10–25 cm (4–10 in) tall

Watering rhythm

Medium indirect light (a couple of metres from a window)

Consistently moist from emergence to dormancy (late winter to late spring)

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Light

Medium indirect light (a couple of metres from a window)

Soil

Humus-rich moist loam, slightly acidic to neutral

Humidity

Moderate (ambient woodland)

Temp

-25 to 25°C

Pet safety

Mildly toxic to pets

Mature size

10–25 cm (4–10 in) tall

Care at a glance

Light

Picture the indirect light an east-facing window gives mid-morning — that's the brightness dimpled trout lily grows fastest in. Best sited under a deciduous canopy receiving dappled light or 2–4 hours of indirect sun daily; summer shade is irrelevant as the plant is dormant by late spring. You'll know it's right when new leaves come out the same size and colour as the established ones. Smaller, paler new leaves = move closer to the window.

Watering

Aim for consistently moist from emergence to dormancy (late winter to late spring) for dimpled trout lily, but treat that as a starting point rather than a rule. A south-facing summer windowsill will dry the pot twice as fast as a north-facing winter room. Lift the pot; if it feels noticeably lighter than it did wet, water it. Native to bottomlands and creek banks, so moist to periodically wet soil in early spring is tolerated; avoid dry soil while leaves are present as the corms are sensitive to drought stress.

Soil and pot

Dimpled Trout Lily grows best in humus-rich moist loam, slightly acidic to neutral. Thrives in soils with high organic matter — incorporate generous amounts of leaf mould or composted bark; drainage must be adequate as standing water during summer dormancy rots corms. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Dimpled Trout Lily sits happiest at around Moderate (ambient woodland) humidity and -25 to 25°C (-13 to 77°F). Performs well under the naturally moderate-to-high humidity of southeastern woodland; mulch with shredded oak leaves to conserve moisture and buffer soil temperature during its brief growing season. If you keep the room above year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed dimpled trout lily sparingly. Apply a light top-dressing of leaf mould in autumn; in established woodland gardens no additional fertiliser is required as natural nutrient cycling sustains the colonies. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on dimpled trout lily in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Corm rot from summer waterlogging — While the plant tolerates moist spring conditions, corms rot readily if the soil stays saturated through summer dormancy; raise planting beds or improve drainage with grit and organic matter.
  • Slug damage to emerging foliage — Slug and snail feeding on young emerging leaves in late winter can severely damage or kill plants before they have stored enough energy in the corm; apply iron-phosphate pellets around plantings at first signs of growth.

Propagation

Divide corm offsets after foliage dies back in late spring to early summer, replanting immediately. Seed is dispersed naturally by ants; collect ripe capsules and sow fresh in a shaded frame. Flowering from seed takes 3–5 years. Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Dimpled Trout Lily is mildly toxic to pets. Erythronium is not listed as a toxic genus by the ASPCA, which explicitly identifies it as a non-dangerous member of the lily family (unlike Lilium and Hemerocallis). No specific toxic principle documented; classified mildly-toxic rather than pet-safe as a precaution, as bulb contact may cause skin irritation. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Dimpled Trout Lily care — frequently asked questions

What is the common name for Erythronium umbilicatum?

Erythronium umbilicatum is most commonly called Dimpled Trout Lily, but it is also known as Dimpled Trout Lily, Trout Lily, Southeastern Fawn Lily. The names refer to the same species, so care instructions for Dimpled Trout Lily apply identically to anything sold as Trout Lily.

How much light does dimpled trout lily need?

Dimpled Trout Lily grows best in medium indirect light (a couple of metres from a window). Best sited under a deciduous canopy receiving dappled light or 2–4 hours of indirect sun daily; summer shade is irrelevant as the plant is dormant by late spring.

How often should I water dimpled trout lily?

Water dimpled trout lily consistently moist from emergence to dormancy (late winter to late spring). Native to bottomlands and creek banks, so moist to periodically wet soil in early spring is tolerated; avoid dry soil while leaves are present as the corms are sensitive to drought stress. The finger-test (or lifting the pot to feel its weight) beats a fixed weekly calendar because pot size, light, and season all change how fast the soil dries.

Is dimpled trout lily toxic to cats and dogs?

Dimpled Trout Lily is mildly toxic to pets. Erythronium is not listed as a toxic genus by the ASPCA, which explicitly identifies it as a non-dangerous member of the lily family (unlike Lilium and Hemerocallis). No specific toxic principle documented; classified mildly-toxic rather than pet-safe as a precaution, as bulb contact may cause skin irritation.

What USDA hardiness zone does dimpled trout lily grow in?

Dimpled Trout Lily is rated for USDA zone 4-9 and RHS hardiness H6. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Dimpled Trout Lily deep-dive guides

Every aspect of dimpled trout lily care, each with its own calibrated guide:

Featured in these plant shortlists

Dimpled Trout Lily qualifies for 8 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

Related guides

Dimpled Trout Lily is also known as Dimpled Trout Lily, Trout Lily, and Southeastern Fawn Lily.