Crape Myrtle Pruning in Florida: Stop Crape Murder

Crape myrtles are among the best small flowering trees for Central Florida. They handle heat and drought, they bloom for months, they have beautiful exfoliating bark, and they are largely trouble free.

They are also the most abused tree in Polk County. Every winter, whole streets of them get chopped back to the same knuckled stumps, a practice known throughout the South as crape murder.

What crape murder does

Cutting a crape myrtle back to thick stubs every year is not just ugly. It actively harms the tree.

• It destroys the natural form. The graceful vase shape and gorgeous mottled bark are the tree's best features, and topping eliminates both.
• It produces weak growth. Dozens of thin whips shoot from each stub, attached only to the outer wood. They bend under the weight of the flowers and flop.
• It delays blooming. The tree spends spring rebuilding what was removed, so flowering starts later.
• It creates knuckles. The swollen, gnarled ends that build at each cut point are permanent scar tissue.
• It opens decay paths. Large stub cuts cannot seal, so rot enters and works down the trunk.
• It commits you to doing it forever. Once the form is destroyed, the tree needs annual intervention to look like anything at all.

The parallel with topping larger trees is exact — same mechanism, same result.

Why people do it

Two reasons, both mistaken. First, imitation: it is done everywhere, so it looks like the normal way. Second, the belief that it produces more flowers. It does not. It produces fewer, later, larger flower clusters on weak stems that flop over. An unpruned crape myrtle blooms more heavily and holds the blooms upright.

How to prune correctly

Correct crape myrtle pruning is mostly restraint. In late winter, before spring growth:

• Remove suckers from the base of the trunks.
• Remove crossing and rubbing branches.
• Remove dead or damaged wood.
• Remove inward-growing branches to open the centre.
• Raise the canopy gradually if you want the trunk structure visible — remove the lowest limbs a few at a time over several years.
• Thin to three to five main trunks if you want a multi-trunk tree form, removing the rest at ground level.
• Take off spent seed heads if you like the tidier look, though this is purely cosmetic.

That is it. Cuts should be small, made to a branch or to the trunk, and the tree should look essentially like itself when you are done.

Choose the right variety and you barely prune at all

Most crape murder happens because the wrong-sized variety was planted. A cultivar that matures at 25 feet planted under a window will need cutting back forever.

Crape myrtles are available in an enormous size range:

• Dwarf — 3 to 5 feet, for beds and containers
• Semi-dwarf — 5 to 12 feet, for foundation planting
• Medium — 12 to 20 feet
• Standard — 20 to 30 feet, for street and specimen use

Match the mature size to the location and the tree essentially prunes itself.

General care in Polk County

• Full sun. Six hours minimum, and more is better. Shade means fewer flowers and more powdery mildew.
• Well-drained soil. Crape myrtles hate wet feet.
• Light feeding. Over-fertilizing produces leaves at the expense of blooms.
• Modest water once established — they are genuinely drought tolerant.
• Mulch out to the drip line, off the trunk.

Common problems

Powdery mildew: white coating on leaves and buds, worse in shade and poor air movement. Modern resistant cultivars largely solve it.

Aphids and sooty mould: black coating growing on aphid honeydew. Treat the aphids.

Crape myrtle bark scale: white or grey felt-like scale on the bark, spreading in the Southeast. Worth identifying early.

Not blooming: usually not enough sun, too much nitrogen, or heavy pruning that removed the flowering wood.

Restoring a butchered tree

It can be improved, over several years:

1. Stop topping it immediately.
2. Let it grow out for a full season.
3. At each knuckle, select the one or two strongest, best-positioned shoots and remove the rest.
4. Repeat annually, gradually building a more natural structure.
5. Accept that the knuckles themselves are permanent.

In severe cases, cutting the whole tree to the ground and training three to five new trunks from the regrowth gives a better long-term result than trying to rebuild from knuckles. Crape myrtles respond well to this, though you lose several years of size.

Get them pruned properly

Luxury Lawns USA prunes crape myrtles the way they should be pruned, across Lakeland and Polk County. Call (863) 279-7724 for a free estimate.