Photo: Vítor JorgeCC BY 4.0via iNaturalistresized / cropped
Mountain Fire Plant Care
Heberdenia excelsa (Aiton) DC.
Updated · Sources · How we source care data
This plant's most distinctive visual feature is its large, glossy, dark green leaves with serrated edges. Originating from the tropical rainforests of Madagascar, Heberdenia excelsa is highly sought after by plant collectors for its unique foliage and ability to thrive in humid environments. Its striking appearance and rarity make it a prized addition to any collection.
Every 4–7 days
Bright indirect light
50–75°F
40–60%
At a glance
How do you care for Mountain Fire?
Water Mountain Fire every 4–7 days, letting the top layer of soil dry out between waterings, and give it bright indirect light. It prefers temperatures of 50–75°F (10–24°C) and 40–60% humidity. Fertilize it every 2 months during the growing season.
What Is the Mountain Fire?
Mountain Fire (Heberdenia excelsa) belongs to the Primulaceae family within the Heberdenia genus. Mountain Fire is native to the Macaronesian archipelagoes of Madeira and the Canary Islands. Mountain Fire is also known as Flame Azalea, Rhododendron calendulaceum.
Mountain Fire displays a low rosette, spreading growth habit, reaching up to 6 ft tall with a spread of approximately 5 ft. Mountain Fire produces small, delicate white flowers in clusters.
Leaf size: approximately 3 inches.
How Often Should You Water a Mountain Fire?
Heberdenia excelsa requires watering every 4–7 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 4–7 days
Let soil partially dry between waterings
What Light Does the Mountain Fire Need?
Mountain Fire thrives in bright indirect light. Avoid placing Mountain Fire in direct, harsh sunlight for extended periods, as this can scorch the foliage.
Light Requirement
Bright indirect light
What Temperature and Humidity Does the Mountain Fire Prefer?
Heberdenia excelsa grows best at temperatures of 50–75°F. Mountain Fire prefers humidity levels of 40–60%.
Temperature
50–75°F
Humidity
40–60%
What Soil Mix Works Best for a Mountain Fire?
Rich, well-draining soil with high organic content. Good drainage is essential for Mountain Fire to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Mountain Fire?
Feed Mountain Fire every 2 months 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 2 months
During the growing season
The PlantoScan app can remind you when to water and when to fertilize each plant.
How Do You Repot a Mountain Fire?
Repot every 1-2 years in early 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 Mountain Fire?
Mountain Fire can be propagated through seeds, division of clumps.
Is the Mountain Fire Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Mountain Fire, so we can't confirm whether it is safe for cats and dogs. Keep pets from chewing it as a precaution.
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 Mountain Fire?
Mountain Fire is susceptible to aphids, spider mites, leaf miners. 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.
What USDA Hardiness Zone Does the Mountain Fire Need?
Mountain Fire grows outdoors in USDA Zone 9b – 11b. It survives winters down to planting zone 9b. Mountain Fire is native to the Macaronesian archipelagoes of Madeira and the Canary Islands. In cooler regions, grow Mountain Fire as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 9b – 11b
Keep exploring plants
Mountain Fire 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 Heberdenia genus — compare its care with other Heberdenia species on PlantoScan.
Heberdenia is part of the Primulaceae plant family — browse all Primulaceae genera and species.
Mountain Fire 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: Heberdenia excelsa (Aiton) DC., family Primulaceae (first published in Prodr. 8: 106 (1844)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Mountain Fire, 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: Vítor Jorge, CC BY 4.0, iNaturalist — original.
- Hardiness zone: USDA Zone 9b – 11b, estimated from the plant's typical growing conditions.
- 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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