Why Wet Weather Is the Worst Time for Weak Trees But the Best Time to Act

When the rain sets in across New Zealand, most homeowners are focused on staying warm, keeping dry, and making sure the firewood supply is ready to go. But there’s another risk quietly building in the background…your trees.

In our experience, wet weather is when weak or damaged trees are most likely to fail. What may have looked stable in summer can quickly become a serious hazard once heavy rain, saturated soil, and strong winds come into play.

If you’ve noticed a tree on your property that doesn’t look quite right, now is the time to act. Timing is key… not after it comes down (cue the crash on the beloved shed or, worst, your home).

What Happens to Trees During Prolonged Wet Weather?

It all comes down to what’s happening below the surface.

1.    Waterlogged Soil Weakens Root Systems

Tree roots rely on stable, compact soil to stay anchored. After days (or weeks) of rain, the ground becomes saturated, loose, and far less supportive.

When this happens:

·      Roots lose their grip in the soil

·      The tree becomes unstable, even if it looks healthy above ground

·      Large trees become significantly heavier due to water absorption

In simple terms, the tree is sitting in mud instead of solid ground.

This is one of the most common causes of trees falling during wet weather in regions like Marlborough and across New Zealand.

2.    Root Damage Becomes a Bigger Problem

If a tree already has compromised roots, from previous storms, disease, or nearby construction, wet conditions will amplify the issue.

Signs of root problems include:

·      Soil lifting or cracking around the base

·      A noticeable lean (especially new movement)

·      Exposed or damaged roots

These are warning signs that shouldn’t be ignored, particularly during the wetter months.

3.    Trees Become Heavier and More Vulnerable

Rain doesn’t just affect the ground. It affects the tree itself.

Branches, leaves, and trunks absorb water, increasing overall weight. This puts additional strain on:

·      Weak branches

·      Split trunks

·      Already stressed root systems

A tree that held up fine in dry conditions may suddenly become too heavy to support itself.

Why Wind + Rain Is the Perfect Storm

On their own, wind or rain can cause damage, but together, they create the highest risk.

·      Wind applies force to the canopy, pushing and pulling the tree

·      Wet soil reduces stability, making it easier for roots to shift

·      Increased weight adds pressure, pushing the tree closer to failure

This combination is why so many trees fall during storms rather than during dry, windy days.

In our experience, it’s not always the biggest storm that causes the most damage, it’s prolonged wet weather followed by sudden wind.

 

Common Warning Signs a Tree May Be at Risk

Before a tree fails completely, there are often signs that something isn’t right.

Keep an eye out for:

·      Trees leaning more than usual

·      Cracks in the trunk or major branches

·      Dead or hanging limbs

·      Mushrooms or fungal growth around the base

·      Soil lifting on one side of the tree

·      Trees sitting too close to structures or power lines

If you notice any of the above, it’s worth getting the tree assessed sooner rather than later.

Preventative Tree Removal vs Emergency Callouts

This is where timing makes all the difference.

Preventative Removal (The Smart Option)

Taking action early means:

·      Safer working conditions

·      Lower costs

·      Controlled removal without damage to surrounding areas

·      Time to repurpose the timber (firewood, mulch, etc.)

It also gives you peace of mind knowing the risk has been removed before the next storm hits.

Emergency Tree Removal (The Costly Option)

Waiting until a tree comes down often leads to:

·      Property damage (fences, roofs, vehicles)

·      Blocked driveways or access issues

·      Higher call-out costs

·      Urgent, high-risk removal conditions

In some cases, fallen trees can also create safety hazards for neighbouring properties or public spaces.

From Risk to Resource: Turning Trees into Firewood

One of the biggest advantages of acting early is the ability to make use of the timber.

At The Firewood Company, we often see how removed trees can be processed into valuable firewood, but only when handled correctly and at the right time.

Instead of letting a fallen tree go to waste, it can be:

·      Cut and split

·      Properly seasoned

·      Used to fuel your home through winter

This approach not only reduces waste but also adds value back to your property.

Why Now Is the Best Time to Act

Wet weather might seem like the worst time to deal with trees, but in reality, it’s when risks are most visible.

Issues that were hidden during summer become obvious:

·      Leaning becomes more pronounced

·      Soil movement is easier to spot

·      Weak branches start to show signs of stress

Acting now means you’re getting ahead of the problem, rather than reacting to it later.

Trees are a valuable part of any property, providing shelter, privacy, and natural beauty. But when they become unstable, they can quickly turn into a serious risk, especially during wet weather.

In our experience, the biggest mistake homeowners make is waiting too long.

If something doesn’t look right, it’s worth getting it checked.

Because when it comes to trees in wet conditions, it’s not a matter of if they’ll fail…it’s a matter of when. Worried? You know who to call!