Palm Tree Care: How to Trim Palms the Right Way

Palms are part of what makes Orange County look like Orange County: Mexican fan palms lining the streets, Queen palms by the pool, big Canary Island date palms anchoring the front yard. But palms aren't built like other trees, and a lot of common trimming habits hurt them. Here's what UC Cooperative Extension and ISA guidance recommend, and how we put it into practice.

A palm has a single growing point, the bud at the top of the trunk. It doesn't branch, and it can't grow new wood over a wound the way an oak or sycamore can. That means:

Damage to the bud can kill the palm. It can't send up a new top.

Trunk wounds are permanent. Cuts, spike holes and gouges never close.

Green fronds are its only food source. Every green frond removed means less energy for the palm.

Picture the palm's crown as a clock face. UC Cooperative Extension recommends removing only dead fronds or, at most, fronds that hang below an imaginary horizontal line running from 9 to 3 o'clock. Leave everything above that line.

A good palm trim removes:

Dead and brown fronds

Flower stalks and seed or fruit clusters, which drop messy fruit and add weight

Fronds that are touching the roof, wires or walls

Stripping a palm down to a small tuft of upright fronds, sometimes called a hurricane cut, pineapple cut or feather duster, is common, but it doesn't protect the palm. University of Florida research after hurricanes found over-pruned palms were damaged more often in storms than palms left with full crowns, because the fronds help protect the bud. Repeated over-trimming also starves the palm, can slow its growth and can leave the trunk narrowed just below the crown.

Removing the old frond bases ("boots") on the trunk is called skinning. Done lightly, it gives a clean look. UC Cooperative Extension warns against excessive skinning and heavy "ball shaping" of the crown, because cutting into the live trunk with a chainsaw creates large wounds where disease can enter. Our crews remove loose, dead boots without carving into living tissue.

ISA advises against climbing palms with spikes for routine trimming. Every spike leaves a permanent hole in the trunk, and those holes can let in disease and decay. At Peterson's, we only use spikes on palms being removed. Palms that are staying get trimmed with rope and harness.

Fusarium wilt is a deadly fungal disease of Canary Island date palms. According to UC Cooperative Extension:

It is spread mainly on pruning tools, especially saws, carrying infected sap and sawdust from one palm to the next. There is no cure once a palm is infected. It is largely preventable with sanitary pruning.

What we do: on Canary Island date palms, we use hand saws rather than chainsaws, because a chainsaw is nearly impossible to disinfect properly, and we sanitize tools before each palm. Our crews disinfect tools between trees on every job, palms included.

Early warning sign: UC describes a frond that's turning brown on one side while the leaflets on the other side are still green, often starting in the older, lower fronds. If you see that on a Canary Island date palm, have an arborist look at it before anyone prunes it.

Established palms in Orange County are fairly drought tolerant, but they look best and resist pests better with regular deep watering in the hot, dry months. Water the root zone around the palm rather than spraying the trunk.

Yellowing or frizzled new fronds often point to a nutrient deficiency, commonly potassium, manganese or magnesium, rather than a lack of water. A slow-release palm fertilizer applied to the root zone is usually the fix. Don't cut off yellowing fronds that are still partly green. The palm is pulling nutrients out of them.

Tall palms are dangerous work. Heavy fronds and seed stalks fall fast, and many palms grow close to power lines. Trimming above ladder height, removing a dead palm, or anything near wires should be handled by a trained, insured crew with full PPE.

Our palm tree service covers trimming, seed-pod removal, careful skinning and palm removal, with full cleanup.