When is the Best Time to Trim or Prune Trees?

The best time to trim trees occurs somewhere between the colorful changing leaves of fall and the beautiful flower blooms in spring. For the most part, you can’t go wrong tree trimming or tree pruning anywhere between late fall and early spring. Make sure to contact your local arborist or tree maintenance service before the spring blooms pop up. With that being said, routine trimming to eradicate weak, diseased, or dead limbs can be achieved anytime throughout the year without causing any extra damage.

Why is Late Fall Through Early Spring the Best for Tree Trimming & Pruning

Fall and winter are the best times to trim trees because that’s when they enter into a dormant stage without growth. This idleness mixed with the colder weather results in a perfect setting for pruning and trimming trees. For example, if you prune or trim after new growth commences, you might halt the plant’s ability to bloom in the next year.

Keep in mind, the sturdier ground of winter allows arborists easier access to the tree and the naked canopy results in an uncompromised view of the branches.

What is Your Tree Trimming or Pruning Goal?

• If your goal is to encourage rapid new growth in the spring, it’s best to trim your tree in the winter dormant season.
• If your goal of pruning/trimming is to manage growth by stunting the branches you don’t want, the ideal time to trim is during summer, which is directly after the seasonal growth period ends.

When is the Best Time to Trim Different Species of Tree?

Oak Trees

Late fall through winter, while the oak is dormant. Most guides give oak wilt as the reason. That disease is a Midwest and Texas problem and is not established in California, so it is not the reason here. What matters in Santa Ana, CA is the invasive shot hole borer, which UC IPM records as damaging and killing landscape trees across Southern California on around sixty species, coast live oak among them. Dormant cuts stay small and close faster, and infested wood is chipped rather than stacked by the house. An arborist working to the ANSI A300 tree care standards is making that cut properly in any month.

Elm Trees

Winter, while the canopy is bare. Dutch elm disease is the reason the national guides give, and it is not what drives the timing on the coastal side of Southern California. The reason that does hold here is simpler: with the leaves off, every crossing branch, old wound and included union is readable from the ground, and the tree is not spending stored energy pushing growth it is about to lose. Clean, sanitised tools matter more than the month.

Pine Trees

Late fall through late winter. Pines hold their own shape and seldom need correcting, so most of what a pine gets is deadwooding and clearance. Damage and hazard come off in any month — a broken limb does not wait for a season. Routine work waits for the cool months because beetles fly in the warm ones and are drawn to fresh resin, which is the one real argument against a summer pine trim.

Crape Myrtles

January or February, while the tree is bare. The usual instruction is to wait for the first frost; in Santa Ana, CA there is no reliable frost to wait for, so go by leaf drop instead. Thin out crossing and inward growth and take off the old seed heads. Do not cut the main stems back to knuckles — topping a crape myrtle costs you the following season's shape and returns weak, whippy regrowth that has to be cut again.

Palm Trees

Any month — a palm has no dormancy to work around. Palm tree trimming takes off dead fronds, flower stalks and fruit rather than shaping a canopy, so the calendar matters far less than the state of the crown. Two things do set the timing in Santa Ana, CA: seed pods and fruit are best off before they drop, and a dead frond skirt is fuel, which is worth clearing ahead of wind season rather than after it. What a palm cannot take is over-trimming — cutting fronds above the horizontal starves the crown and it does not grow back thicker.

Bushes and Shrubs

It follows the same rule as the trees, and then varies by species. Non-flowering shrubs — the privet, xylosma, pittosporum and boxwood that make up most Santa Ana, CA hedging — take a cut in any month except the late-autumn push, which produces soft growth just as the nights turn. Spring bloomers such as ceanothus and bougainvillea are best cut straight after they finish flowering, so you are not removing next season's buds. When in doubt, prune in the dormant season.

Final Thoughts

There are many different factors to sift through when deciding on the best time of year to trim your trees. That’s why we offer a free estimate on our tree trimming and pruning services. Our ISA Certified Arborist knows exactly what to look for when it comes to caring for the health and safety of your trees. Give us a call to set up a visit today!