Fungus at the base of a tree is one of the signs we list for a tree health assessment. Broadway Tree Care is based in Inverness, and if you searched for tree service Inverness FL, that page covers the town and how we reach it. This post is about what a mushroom at the base of a tree can mean, what you can check yourself, and what usually happens next.
The fungus facts here come from UF/IFAS Extension's Mushrooms Are Popping Up Everywhere. It is general Florida guidance, not a diagnosis of any one tree.
What does fungus at the base of a tree mean?
| Where the fungus is | What it can mean | Next step |
|---|---|---|
| On mulch piled against the trunk | The mulch, not necessarily the tree | Pull mulch back and look at the flare |
| At the base or on the root flare | Possible decay in the roots or lower trunk | Assessment soon |
| Shelf fungus on the trunk | Possible decay inside the trunk wood | Assessment, especially near a target |
| Over the root zone, away from the trunk | Possible root decay, or buried wood such as an old stump | Assessment if the tree is also declining |
A mushroom is the visible fruiting body of a fungus. UF/IFAS Extension says one Florida fungus, Armillaria root rot, shows up as clusters of yellow to honey-colored mushrooms, and that it infects the roots of trees and shrubs, causing them to decay, weaken and even die. It says symptoms often appear only after infection, and that Armillaria usually attacks trees that are already stressed. That is why we treat fungus at the base as a reason to look, not as something to wipe away.
Why does it matter more around Inverness?
Inverness sits on the western shore of the connected Tsala Apopka and Henderson lakes. Along the water, soil moisture is one condition to check on a lakeside property, because saturated soil can increase the likelihood of failure, particularly where a tree already leans or has root defects. Soil lifting or splitting on the high side of a leaning tree, especially after a storm, points to the root plate letting go. That is why a mushroom on a leaning tree near the lakes is worth a call sooner rather than later.
What can you check before you call?
You do not need tools to gather useful information:
- Whether the root flare is visible where the trunk widens into the soil, or buried under mulch or fill
- Soil that is cracked, raised or lifting on one side of the tree
- Bark coming away in patches, or a wet, dark seam on the trunk
- A canopy that leafed out thinner or later than it used to
- Dieback starting at the branch tips and working inward
- Any trenching, fill, a new driveway or heavy equipment near the tree in the last few years
That last one matters because root damage from trenching, driveway work, fill or heavy equipment may not show in the canopy for two or three seasons. Tell us what changed near the tree so the assessment can account for it. Our guide to protecting tree roots during yard construction covers that side of it.
Can a tree with fungus at the base be saved?
Sometimes, and the cause decides. A tree with a fixable problem, such as a root flare buried under mulch, is a different case from one with root rot. UF/IFAS Extension says that once Armillaria has shown up, it is generally impossible to save the plant, and advises removing the infected plant including the roots. At that point the question is how long the tree stays safe, and the answer depends on what it would hit.
If the tree is sound but has a weak fork, tree cabling and bracing can sometimes keep it standing. If it has to come down, our tree removal quote includes cleanup and haul-off.
What happens at a tree health assessment?
We start at the ground. The root flare should be visible where the trunk widens into the soil, and on a declining tree it can turn out to be buried under fill, years of mulch or a raised bed. Then we look at the trunk and unions for seams, sunken or discolored areas and fungal growth, then the canopy. You get told what we found in plain language: whether the tree needs removal, needs work, or needs leaving alone. If work is warranted you get a written quote. If nothing is, we say that too. Our tree health assessment page has more detail.
Source: UF/IFAS Extension Orange County, "Mushrooms Are Popping Up Everywhere," posted May 24, 2018, last updated July 2, 2021 (link). The lake and soil points come from our own Inverness and tree removal signs pages. This is guidance for Florida in general, not a diagnosis of any one tree.