Image: AI generated
Earth-tongue Plant Care
Geoglossum glabrum
Updated · Sources · How we source care data
Geoglossum glabrum is a unique plant known for its striking black, tongue-shaped leaves that grow in a clustered formation. This rare fungus is commonly found in damp, forested areas and is highly sought after by mushroom enthusiasts for its distinctive appearance.
Every 7–14 days
Bright indirect
55–70°F
60–80%
At a glance
How do you care for Earth-tongue?
Water Earth-tongue every 7–14 days, letting the top layer of soil dry out between waterings, and give it bright indirect light. It prefers temperatures of 55–70°F (13–21°C) and 60–80% humidity. Fertilize it every month during the growing season.
Where Is the Earth-tongue Native To?
- Albania
- Austria
- Belarus
- Belgium
- Bosnia and Herzegovina
- Bulgaria
- Canada
- Croatia
- Cyprus
- Czechia
- Denmark
- Estonia
- Finland
- France
- Germany
- Greece
- Hungary
- Iceland
- Ireland
- Italy
- Latvia
- Lithuania
- Luxembourg
- Malta
- Mexico
- Moldova
- Montenegro
- North Macedonia
- Norway
- Poland
- Portugal
- Romania
- Russia
- Serbia
- Slovakia
- Slovenia
- Spain
- Sweden
- Switzerland
- The Netherlands
- Ukraine
- United Kingdom
- United States
What Is the Earth-tongue?
Earth-tongue (Geoglossum glabrum) belongs to the Geoglossaceae family within the Geoglossum genus. Earth-tongue is native to North America, Europe, Asia. Earth-tongue is also known as Smooth earth tongue.
Earth-tongue displays a clumping, terrestrial growth habit, reaching up to tall with a spread of approximately . Earth-tongue produces none.
Leaf size: approximately 4 inches.
How Often Should You Water a Earth-tongue?
Geoglossum glabrum requires watering every 7–14 days. Allow the top layer of soil to dry between waterings to prevent root rot. Reduce watering frequency during winter when growth slows.
Watering Frequency
Every 7–14 days
Let soil partially dry between waterings
What Light Does the Earth-tongue Need?
Earth-tongue thrives in bright indirect light. Avoid placing Earth-tongue in direct, harsh sunlight for extended periods, as this can scorch the foliage.
Light Requirement
Bright indirect
What Temperature and Humidity Does the Earth-tongue Prefer?
Geoglossum glabrum grows best at temperatures of 55–70°F. Earth-tongue prefers humidity levels of 60–80%. A pebble tray or humidifier helps maintain adequate moisture around the plant.
Temperature
55–70°F
Humidity
60–80%
What Soil Mix Works Best for a Earth-tongue?
Well-draining soil mix. Good drainage is essential for Earth-tongue to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Earth-tongue?
Feed Earth-tongue every month during the growing season (spring and summer) with a balanced fertilizer diluted to the strength on the label.
Pause feeding in autumn and winter, when growth slows, and never fertilize dry soil — water first.
Fertilizing
Every month
During the growing season
The PlantoScan app can remind you when to water and when to fertilize each plant.
How Do You Repot a Earth-tongue?
Repot every 1-2 years in spring. Choose a pot one size larger than the current container, and ensure it has drainage holes to allow excess water to escape.
How Do You Propagate a Earth-tongue?
Earth-tongue can be propagated through by spores or division.
Is the Earth-tongue Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Earth-tongue, so we can't confirm whether it is safe for cats and dogs. Keep pets from chewing it as a precaution.
Never eat a wild mushroom based on an app identification. Many mushrooms have poisonous lookalikes, and edibility must never be judged from an app.
This is a general caution, not veterinary or medical advice. If your pet ate a plant, contact your vet or animal poison control.
See all plants toxic to cats and plants toxic to dogs.
What Pests and Diseases Affect the Earth-tongue?
Earth-tongue is susceptible to none known. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.
Yellow leaves, brown tips or drooping? See common plant problems and how to fix them.
Keep exploring plants
Earth-tongue is one of many species covered in the complete plant care and identification guide, which groups plants by genus, attribute, and popularity.
It belongs to the Geoglossum genus (family Geoglossaceae) — search all Geoglossum species in the plant lookup.
Earth-tongue thrives in bright light and direct sun — see other bright-light plants.
Related Plant Care Guides
Closely related plants with similar care requirements:
Sources
- Scientific name & taxonomy: Geoglossum glabrum, family Geoglossaceae — World Flora Online.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Earth-tongue, so we can't confirm whether it is safe for cats and dogs. Checked against the ASPCA plant list; any other toxicity note on this page comes from PlantoScan's plant database.
- Photo: AI-generated illustration (labelled on the image).
- Care values(watering, light, temperature, humidity, soil, fertilizing): PlantoScan's plant database, filtered by automatic plausibility checks — values that fail them are hidden. How we source and check plant data.
Spotted a mistake? Email info@upvision.media with the page link — we check and correct reported errors.
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