Mountain Mahogony and wildfire? - Ask Extension
Our neighborhood (near Horsetooth Reservoir) is working on becoming more wildfire resistant. But we don't understand Mountain Mahogony.
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Mountain Mahogony and wildfire? #928588
Asked April 16, 2026, 12:24 PM EDT
Our neighborhood (near Horsetooth Reservoir) is working on becoming more wildfire resistant. But we don't understand Mountain Mahogony.
Your page (https://extension.colostate.edu/resource/firewise-plant-materials/) says that "Common flammable shrubs are Gambel oak, three-leaf sumac and mountain mahogany"
But other sites (flashwildfireservices.ca/blogs/news/the-best-fire-resistant-landscaping-plants-for-your-region, https://berkeleyca.gov/sites/default/files/documents/FireResistantPlantList.pdf) include it in their lists of Fire-Resistant plants.
Can you clarify how much we should worry about it?
Larimer County Colorado
Expert Response
Hello,
Do you already have this plant in your landscape areas? Or are you planning to plant it?
Mountain mahogany can be both a good plant for fire-prone areas, but it can also be problematic. So...it depends. All plants can burn, but a lot depends on management and the nature of the fire. As a native plant, it was likely to be exposed to fire and can recover more quickly following burning than other plants. It can "scorch" and burn very hot, so that's something to consider.
It wouldn't be good to plant near structures and if planted under trees, then you'll want to prevent "laddering" by limbing up trees. So just think about management and placement of this shrub.
Do you already have this plant in your landscape areas? Or are you planning to plant it?
Mountain mahogany can be both a good plant for fire-prone areas, but it can also be problematic. So...it depends. All plants can burn, but a lot depends on management and the nature of the fire. As a native plant, it was likely to be exposed to fire and can recover more quickly following burning than other plants. It can "scorch" and burn very hot, so that's something to consider.
It wouldn't be good to plant near structures and if planted under trees, then you'll want to prevent "laddering" by limbing up trees. So just think about management and placement of this shrub.
Thanks for your thoughts! The real question is what to do about the plants that are already covering our hillsides. Like between the highway and our neighborhood that might burn from a careless driver tossing a cigarette. Would fire spread rapidly through such mahogany and so we should try to limit its growth or is it hard to ignite and slow to burn so it isn’t worth the worry. I’ve looked for studies on fire movement through different sorts of vegetation but can’t find much?
Hi again,
It's a chaparral species and therefore not only likes to burn, fire gives it a competitive advantage against other plants. The leaves are resinous and burn intensely. It would depend a lot on how close those plants are to structures.
Perhaps it's best to consult with your fire department and ask them for guidance on this specifically. You wouldn't want to void the entire hillside of plants.
Our publications discourage the planting of this plant in Zones 1 and 2. Zone 1 is 0-5 feet; Zone 2 is 5-30 feet. https://csfs.colostate.edu/wp-content/uploads/2023/05/CSFS_CSU-Ext_Fact-Sheets_LFLP_FINAL_web.pdf
It's a chaparral species and therefore not only likes to burn, fire gives it a competitive advantage against other plants. The leaves are resinous and burn intensely. It would depend a lot on how close those plants are to structures.
Perhaps it's best to consult with your fire department and ask them for guidance on this specifically. You wouldn't want to void the entire hillside of plants.
Our publications discourage the planting of this plant in Zones 1 and 2. Zone 1 is 0-5 feet; Zone 2 is 5-30 feet. https://csfs.colostate.edu/wp-content/uploads/2023/05/CSFS_CSU-Ext_Fact-Sheets_LFLP_FINAL_web.pdf
Thank you so much for the info!
