When to prune crape myrtles in South Louisiana comes down to late winter, around February, while the branches are bare, and even then most trees need only a light cleanup. Chopping the tops off, known as “crape murder,” does the tree more harm than good.
When is the best time to prune crape myrtles in Louisiana?
Late winter. The LSU AgCenter names February as the month for crape myrtles, and Clemson’s extension team gives the same window in plainer terms: while the plant is dormant, before growth begins. With the leaves gone you can see every crossing branch and every weak limb, which makes the job easier to do well.
Timing matters on the early side too. The AgCenter has pointed out that plenty of people prune in August, September and October, and that any pruning should wait until winter.
| Time of year | What to do |
|---|---|
| August to October | Leave it alone. Too early, and the AgCenter says to wait for winter. |
| February (late winter) | The pruning window. Light thinning while the tree is bare. |
| Rest of the year | Dead or damaged branches and base suckers can come off whenever you spot them. |
How much can you cut off a crape myrtle?
Not much. Every cut should have a reason. The LSU AgCenter’s own advice is blunt: if you cannot come up with a good reason to prune the tree, leave it alone.
Good reasons include:
- Branches that cross or rub against each other
- Low branches in the way of the mower or the walkway
- Weak, thin twigs crowding the inside of the canopy
- Old seed pods
- Suckers growing from the base of the trunk
Keep to branches no thicker than your finger. If a bigger branch truly has to go, cut it back to a side branch or to the trunk. Do not shorten it and leave a stub. The AgCenter also does not recommend major pruning just to bring the height down.
What is crape murder, and is it bad to cut crape myrtles back hard?
Crape murder is the habit of cutting the main branches back to the same blunt spot every year. The term is a joke with a point. Horticulturists call the technique pollarding, and it is wrong for this tree.
Here is what it does:
- Weak regrowth. The lush shoots that sprout at the cuts look vigorous, but the AgCenter describes them as structurally weak and more prone to powdery mildew.
- Knobs. After a few seasons, swollen, lumpy knuckles form where the cuts were made.
- Lost reserves and rot. Topping removes the food the tree stored in that wood, and the large open cuts give wood-rotting organisms a way in, according to UF/IFAS.
- A shorter life. The AgCenter says pollarding shortens the life of a crape myrtle.
Topping does not kill a healthy tree, and that is part of why it persists. The tree survives and keeps getting hacked.
Does cutting a crape myrtle back make it bloom more?
No, though many people have been told it does. The flower clusters can come out bigger on a topped tree, but they sit on long, thin shoots. The added weight bends the branches over, especially after rain. A smaller tree also carries fewer clusters overall, and UF/IFAS notes that topping can delay flowering by up to a month.
Will a topped crape myrtle recover?
It will grow back, but not to what it was. Expect the knobs to stay and the regrowth to stay fragile. Because a topped tree tries to return to its full size, it has to be cut again each year, and the cycle never ends.
The way out starts with not cutting it again next February. If the tree has been topped for years, an arborist can look at the stubs and tell you whether the regrowth can be sorted out or whether the tree would be better replaced. A crape myrtle that looks sick rather than butchered, with mildew, thin leaves or dieback, is a different question, and that falls under tree health care.
What if my crape myrtle is just too big for its spot?
This is why most crape myrtles get topped. A tall variety goes in next to the house, grows into the gutters, and the owner starts cutting it back. The AgCenter’s example is a white-flowered tree at the corner of a house: Acoma matures at 10 to 12 feet, while Natchez reaches 25 to 30 feet. Cutting a Natchez to Acoma size has to be repeated every year, and it never looks right.
An upright variety also cannot be cut into a different shape. The new growth just heads straight up again. Picking the right size for the spot at planting time saves the pruning later.
If a mature tree is already too close to the roof, tree trimming and pruning by a licensed arborist can reduce the contact with proper cuts, rather than another round of topping. Louisiana Tree Masters has been in the field since 1994 and works across Lafayette, Youngsville and the rest of Acadiana, and a free estimate is the place to start.
