Snow Killed Your Citrus Tree?
It May Just Be Recovering!
While Louisiana’s growing season is much longer than the majority of the U.S., we’re no strangers to multiple cold spells in the winter. In 2024-2025, we even saw an especially rare snow event, with multiple nights in a row below freezing to follow. For fruits like apples, peaches, and plums, these chilling hours are vital to fruit production by breaking dormancy. Citrus trees, however, prefer sunshine and tropical heat 365 days a year.
Gardeners and the industry alike have been working out how to plant citrus trees in subtropical, temperate, or even semi-frigid areas since we got a taste for them. New methods of grafting and selective breeding have made for hardier rootstocks and trees. Dwarf varieties make it feasible for trees to be container grown to maturity, and thus easier to move indoors come the threat of freezes. For in-ground trees, heavy mulching or even full canopy coverage when possible are great added layers of defense. Even still, many gardeners will need to address the damage after it’s been done.
Which Citrus Trees Are
Most Susceptible to Cold Damage?
Different kinds of citrus trees fare better or worse through wintertime cold spells; Satsumas, kumquats, & some oranges can recover surprisingly well from a few nights below freezing. Lemons, limes, & grapefruits are especially sensitive to temperatures that even approach freezing. We still recommend overcompensating no matter the variety when preparing for freezes, but if you’ve only got a limited supply of frost cloth… women and children first!
The Different Levels of
Cold Damage in Citrus Trees
Not all cold-damage looks the same. Depending on the specific variety, how well established, or how well protected, your trees might recover smoothly come time for fruit production. Let’s look at the different “levels” of cold damage so you can quickly assess your options:
- Light Cold Damage (High-likelihood of Recovery): The first sign of cold-stress is wrinkled leaves. This is a defense mechanism meant to limit moisture loss and reduce the affected surface area. If a week after the cold event, the majority of leaves are still green and attached to their branches, it is bouncing back in force.
- Medium Cold Damage (Questionable-likelihood of Recovery): The next rung on the cold-damage ladder is the beginning of defoliation. The majority of the canopy has turned yellow and – within a week of the event – many have fallen. Still, some leaves remain attached, and most stems and branches remain a healthy green color. In these cases, our bleeding hearts can’t help but try to encourage a full recovery.
- Heavy Cold Damage (Low-likelihood of Recovery): A week after the cold event, your tree has lost all of its foliage. Even worse, the green stems and branches have turned a sad yellow or brown. These symptoms are common when trees are hit with multiple prolonged freezes within a single month. While not impossible, recovery is unlikely.
The Roots May Survive,
But Your Citrus Tree May Not
An important note about citrus trees is the presence of a grafted rootstock: In short, the notch towards the bottom of the tree trunk – the graft union – is where a hardy rootstock was merged with the true-fruiting citrus tree you love. This rootstock is often able to survive harsh weather events that the fruiting tree does not. In such cases and when allowed to recover, the rootstock will take over the tree and produce undesirable fruit that is different from the variety you purchased. This is important to know for our next tip: How to tell if your citrus tree is still alive.
The Scratch Test: How to Tell
if Your Citrus Tree Is Still Alive
In the case of medium to heavy cold damage, it can take months of waiting just to see if your tree is still alive. Those months could be better spent cutting your losses and getting a new tree started in its stead. However, you can skip the wait-and-see process by utilizing the “Scratch Test”.
Lightly scratch the tree trunk with your fingernail 2-4 inches above the graft union. The scratch doesn’t need to be deep or large; just enough to see beneath the brown outer layer. If the scratch reveals green, moist tissue, the odds are good that your tree is still alive! If the tissue is brown-white and dry, this is good confirmation of a dead tree. It may serve you to do this in multiple spots around the trunk.
Scratching below the graft union will only confirm the survival of the rootstock, not the true-fruiting tree it’s grafted to.
Road to Recovery: Getting Your
Citrus Tree Back On Track
If you’re determined to see it through, there are a few things you can immediately do to aid the citrus tree’s recovery process:
- Water Thoroughly: Deep waterings after a cold snap help to rehydrate your tree and support new growth. Strike a balance between replenishing the soil & mulch with moisture and creating “wet feet” by drowning the area.
- Be Extra Cautious of Future Freezes: If one freeze is bad, two is downright brutal. Check the weather frequently and overprepare should another freeze occur. Heavily mulch the base, heavily water the day before, wrap your tree with incandescent christmas lights, and create an air-tight frost-cloth structure that avoids touching the tree.
- Wait & Reduce Fertilizer Use: With a lack of foliage, it can be tempting to reinvigorate growth with a healthy dose of fertilizer. Instead, you’ll do better to reduce the application of fertilizer proportionate to the amount of cold-damage present, spreading out the amount over multiple applications. You can begin safely applying fertilizer in early spring.
When to Prune Cold Damaged Citrus Trees:
Dead Branches & Growth
Typically, you can begin pruning a healthy citrus tree just before spring after the threat of frost has passed. This is often paired with the first application of fertilizer, and is a great strategy for encouraging new growth. However, there are more factors to consider when dealing with a cold-damaged tree. For instance, seemingly dead branches may still be viable but just a bit slow to produce new leaves and stems. Alternatively, seemingly viable trunks & branches may put out new shoots that fail shortly thereafter.
If you’re serious about properly shaping your tree for long-term benefits, it’s best to wait and see what’s really dead or alive. Dead branches will completely dry out by the end of summer to early fall. Their appearance will be distinctly dark brown or black, and no new leaves or shoots will appear. Once it’s obvious who made the cut… you can go ahead and make the cut!
