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Gardening With Tony

Utility Cables Need Space
Posted by Tony Tomeo on Mar 15, 2013 - 10:09:27 AM

UNITED STATES—Since I did not make the drive up or down the coast very often, the rare silvery-gray Bismarck palm that I could see slowly climbing into the skyline near the edge of Highway 101 through Santa Barbara seemed to be slightly taller every time I saw it. It grew slowly, but enough to notice since I only saw it less than annually. Then, when I drove by about a month ago, it was gone.

This exemplary specimen had been quite healthy and happy (even though Bismarck palms are not supposed to be happy on the coast). There was only one problem. It was under high voltage utility cables. As it grew, it got too close to the cables, so needed to be removed in order to maintain the minimal clearance required for high voltage.

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Silvery gray that is almost comparable to blue spruce is even more striking from a palm, like the Bismarck palm.

Unlike other trees, palms have only single terminal buds that grow upward. They can not develop branches to grow around cables, so only die if the single bud needs to be pruned away. Complete removal is therefore the only option when palms begin to grow into high voltage cables.

Sadly, palms often get planted under utility cables. Many Mexican fan palms grow under cables because birds that eat their fruit drop the seed there. Queen palms are popularly planted around the perimeters of back yards, and along the back fence lines that are very often directly below and parallel to high voltage cables.

Trees that are not palms can get disfigured by pruning for clearance around high voltage cables, but generally survive. Trees with central leaders (single trunks) and strict form, such as spruces and redwoods, can get be so disfigured that removal may be more practical than pruning. Trees with more irregular form, like sycamores and elms, are somewhat easier to salvage. Unfortunately, crews hired to maintain clearance are unable to prioritize the health and structure of trees that get too close to high voltage cables.

Lower cables for telephone, television and house-drops (lower voltage cables that extend from utility poles to homes and other buildings) do not often justify pruning for clearance like upper high voltage cables do. However, these lower priority cables can still be damaged if too many limbs sag onto them or become abrasive as they blow in the wind. Really, it is best to avoid problems with utility cables by selecting and planting trees that are not likely to become too obtrusive. Palms, large trees and trees that are likely to be severely disfigured by pruning to maintain clearance should be kept at safe distances.

Highlight: Bismarck Palm.

Most palm enthusiasts believe that the distinguished Bismarck palm, Bismarckia nobilis, is rare because it does not like local climates. It can be damaged by frost in winter, and prefers warmer weather in summer. Another concern is that they get too broad for compact urban gardens, since their shady foliar canopies can get more than twenty feet wide. However, a few seemingly happy specimens are sometimes seen about town.

Foliage of this rare palm is strikingly silvery gray. Green Bismarck palms are even more scarce, both because they are less tolerant to frost, and because they are not so striking. The big and rather rounded leaves are more than six feet wide, and maybe up to eight feet wide, on petioles (stalks) about six to eight feet long!



 

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Serving Bel Air, Benedict Canyon, Beverly Hills. Brentwood, Laurel Canyon, Los Feliz, Malibu, Pacific Palisades, Melrose, Santa Monica, Sherman Oaks, Studio City, Topanga, Canyon, Westwood & Hollywood Hills.