Freeze Damage on Florida Trees: Wait Before You Cut

Coastal Volusia does not freeze often, and when it does the whole county wants to prune the next morning. Brown, mushy leaves on the tabebuia, black tips on the hibiscus, a mango or avocado that looks cooked, a palm with a collapsed crown. The instinct is to cut off everything that looks dead.

That instinct is wrong in almost every case. What a freeze does to a tree takes weeks to fully show, and cutting too early takes off living wood, removes protection the tree needs, and can trigger new growth right before the next cold snap.

What freeze damage actually is

Ice forms inside plant cells and ruptures them. The tissue dies, dries and turns brown or black. Leaves and soft new growth go first, then the thin twigs, then, in a severe freeze, larger stems. Bark can split as the trunk freezes and thaws.

Damage is worst on the exposed upper and outer parts of the canopy, on the side facing the cold wind, and in low spots where cold air settles. Trees near the Indian River, the Halifax or a large lake usually fare better because the water moderates the temperature. Inland areas like DeLand, Deltona and Orange City freeze harder and more often than the beachside.

Which trees are at risk here

Native trees (live oak, sabal palm, magnolia, cypress, pine, red maple) shrug off any freeze our area gets. The trees that take damage are the tropical and subtropical ornamentals that people plant because they usually get away with it:

• Mango, avocado, papaya and other tropical fruit
• Royal poinciana, tabebuia, jacaranda
• Queen palm, foxtail palm, coconut and other cold-sensitive palms
• Ficus, schefflera, gumbo limbo
• Citrus, which is hardier than the above but still vulnerable in a hard freeze, especially young trees

The waiting rule

Do not prune freeze damage until the tree tells you where the live wood is, and that means waiting for new growth in spring. In coastal Volusia that is usually March or later.

There are three reasons:

1. You cannot tell what is dead yet. Brown leaves do not mean a dead branch. Scratch the bark with a thumbnail: green underneath is alive. Even that test is unreliable for a few weeks after a freeze because the damage keeps developing.
2. Dead material protects live material. The scorched outer canopy insulates the interior against the next freeze. Strip it off in January and the next cold night reaches deeper into the tree.
3. Pruning stimulates growth. New flush in February is exactly what the next freeze will kill.

When new growth emerges, it draws a line. Cut back to just above healthy buds or a live lateral, into wood that is green under the bark. Our post on the branch collar covers making those cuts correctly.

Palms after a freeze

Palms are a special case because they have one growing point. Freeze damage to the fronds is cosmetic. Damage to the bud at the top of the trunk is fatal, and you will not know for weeks.

After a freeze on a cold-sensitive palm:

• Leave the damaged fronds on for now
• Watch the spear, the newest unopened frond in the center. If it pulls out easily and is rotten at the base, the bud is damaged.
• Some growers apply a copper fungicide drench into the crown to reduce secondary rot in the damaged bud. That is a judgment call and it does not save a palm whose bud is already dead.
• If a new spear pushes in spring, the palm will recover. It may take a full year to look normal.

Do not cut a freeze-damaged palm back hard. See When to Trim Palms in Florida for why removing green fronds hurts a palm even in a good year.

Bark splits

A vertical split in the trunk after a freeze, with the bark lifting on either side, is a frost crack. Leave it. Do not fill it or paint it. The tree will callus over it in most cases. Watch it over the following year for decay.

When to call

Freeze damage itself rarely needs a professional. Call for tree trimming or removal if a large tree has split bark or a major limb has died and is over something, if a large palm has lost its crown and the trunk is now a hazard, or if you are unsure whether a valuable tree is worth waiting on. We will tell you honestly, and we will usually tell you to wait.

Frequently asked questions

Should I water after a freeze?

Yes, if the soil is dry. Freeze-damaged trees still need water and dry soil adds stress. Do not fertilize until the tree is actively growing again.

My citrus dropped all its leaves. Is it dead?

Probably not. Citrus drops leaves after a freeze and often regrows from the branches or the trunk. Wait for spring growth and then prune back to live wood. Growth from below the graft is rootstock and should be removed.

The whole crown of my queen palm is brown. Is it gone?

Not until the spear pulls out or fails to push new growth by late spring. Wait and see. Do not remove the brown fronds until a new spear has emerged.

Can I cover trees before a freeze?

Small trees, yes. Cover to the ground with cloth (not plastic touching the leaves) to trap ground heat, and remove it in the morning. Large trees cannot be protected and do not need to be.

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ArboristRX assesses and prunes freeze-damaged trees across Edgewater, New Smyrna Beach, Port Orange, DeLand, Deltona and Volusia County. Call (386) 444-5959 in spring, once the tree has shown you what survived.