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Live Christmas Trees

Some live Christmas trees grow too big for home gardens.

They appear to be so simple and innocent now, shorn strictly into conical form and perhaps adorned with any remnants of their Christmas time employment, but living Christmas trees can potentially become big problems. Italian stone pine, which is one of the most popular living Christmas trees, can get nearly eighty feet tall and sixty feet wide, with massive trunks and limbs! Regardless, they often get planted in small gardens and tight situations after Christmas because they do not seem like they would do any harm.

Most living Christmas trees can eventually become large trees. Canary Island pine, Aleppo pine, Monterey pine and Afghan pine are the most notorious since they are the most common, and also because they are not so easily recognized while they are young Christmas trees. Their juvenile foliage is more softly textured and often lighter colored than their more substantial adult foliage.

These most common living Christmas trees do not like to stay potted for very long, and are not very conducive to subsequent shearing. Consequently, many do not survive through their first summer, and those that do often get planted in the garden without much thought. Until recent years, they were seldom labeled; so few people knew how big they could get.

Coastal redwood, giant redwood, deodar cedar and Arizona cypress as living Christmas trees are neither as common, nor as likely to not get recognized as trees that eventually get quite large. They need their space nonetheless. Fortunately, they are generally somewhat more practical for some spacious gardens than the large pines are.

Scotts pine, Austrian black pine (rare), Japanese black pine, Eastern red cedar (juniper), Rocky Mountain juniper, some arborvitae and the various spruce are some of the best living Christmas trees. They grow somewhat slowly, are more cooperative with pruning and can live in tubs long enough to function as Christmas trees for a few years. When they eventually get too large for their pots, they are not so likely to get too large for the garden.

Whether a Colorado blue spruce being retired after ten years of service or an Italian stone pine being retired after only a single Christmas, a living Christmas tree needs some help with the transition from pot to garden. Any circling roots should be severed when the pot gets removed. Otherwise, roots become constricted as the circling roots grow and expand.

Much of the dense foliar canopy should be thinned out to compensate for confinement of roots. Besides, much of the shorn growth is actually disfigured and will eventually get replaced and shed as new growth develops above the original canopy. Formerly pruned spruce, redwood, deodar cedar and most pines may need minor trimming of the upper new growth to promote a single leader (that will develop into the main trunk).

It is best to plant living Christmas trees rather soon after Christmas so that they can loiter in the garden through winter. Rain and cool temperatures keep them from desiccating as their roots start to disperse before new foliage starts to emerge in spring. Newly planted living Christmas trees should be watered somewhat regularly during their first year because their roots take some time to disperse adequately.

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Big Shrubbery or Small Trees

Pittosporum undulatum is a large shrub that can become a small tree.

            Shrubbery behaving badly can be a problem. Many seemingly innocuous shrubs get planted in situations where they do not fit, and soon get too big for the space available. Others do not get shorn or pruned as they should, or simply get neglected, and eventually get overgrown. Many others have sneaky ways of sowing their seeds in awkward places where they would not otherwise get planted by anyone who knows better.

            Most home improvement shows on television would simply recommend removing obtrusive, overgrown or inappropriate shrubbery and replacing it with something more proportionate, appropriate and stylish. What a waste! Hidden within overgrown shrubbery, there are sometimes potentially appealing small trees that only need to be released from thickets of overgrowth.

            Overgrown Australian tea tree, sweet olive (Osmanthus fragrans), xylosma, glossy privet, ‘Majestic Beauty’ Indian hawthorn, and larger types of oleander, holly, pittosporum, cotoneaster and juniper are often easily salvaged by aggressive selective pruning rather than indiscriminate pruning for confinement. Lower growth that has become obtrusive, disfigured or otherwise unappealing can be thinned or removed to expose substantial sculptural trunks within. Upper growth that is out of the way can be left intact or thinned as necessary, but should not shorn or pruned indiscriminately. This creates informal small trees with distinctive trunks from what had been overgrown shrubbery.

            Some shrubbery may need some time to grow out of its former confinement, and may be somewhat unsightly during the process. As they develop though, they should require less maintenance, since most of their growth should be up out of the way instead of where it is in constant need of pruning for confinement. 

            Many small trees that often get shorn into shrubbery would similarly do better with selective pruning to enhance natural branch structure and eliminate congested thicket growth. Japanese maples, redbuds, smoke tree, English hawthorn, crape myrtle, parrotia, loquat, strawberry tree, Pittosporum undulatum, and small types of magnolias, acacias, and yew pines (Podocarpus spp.) are notorious for getting shorn into unmanageable shrubbery. Pineapple guava, photinia, toyon, hop bush, larger types of bottlebrush and smaller types of melaleucas are more conducive to being shorn and pruned as large shrubbery, or can be pruned into small trees if preferred.

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Horridculture – Aberraculture

Totem of aberrative arboriculture

“Aberraculture” is no more a real word than “horridculture” is. Just as “horridculture” is like a contraction of “horrid” and “culture” that seems to describe horrid horticulture without actually doing so, “Aberraculture” is like a contraction of “aberrative” and “culture” that seems to describe aberrative arboriculture without actually doing so. Perhaps the illustration above provides a better explanation. I suspect this happened because the entire canopy of this particular Quercus agrifolia, coast live oak, extended over the fence and the driveway within the fence from which it needed to be pruned for clearance. However, because of the fence at the edge of the driveway, the trunk could not be cut completely to the ground. Whoever did this lacked access through a nearby gate. The dinky limb and stubbed limb at the top of this severed trunk seem to be a pathetic attempt to cut back to a lateral limb, as if it somehow makes this a proper cut. If this trunk had remained, it would have generated rampant growth that would extend in all directions, including back over the driveway that necessitated this procedure. It is gone now, and the stump should be dead. Because this was on a property where I work, I did not want anyone to see it there. I have no idea who did it, since it was done for an adjacent property, and whoever made arrangements for it did not want to trouble us with it. I only noticed because the adjacent property happens to be a bank that I do business with. I probably should occasionally inspect such fenclines for potential problems before something like this happens again. They are easy to neglect because, although close to some landscapes outside, they are so far from the trees and refined landscapes that we maintain within.

Does cutting back to a lateral limb somehow make this a proper cut?!
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Western Red Cedar

Western red cedar makes nice garland.

This coniferous evergreen is more appealing as seasonal foliar decor than it is practical. Western red cedar, Thuja plicata, is the most common component of Christmas garlands. Also, it is very popular for wreaths of mixed evergreens. It is the same genus as common arborvitaes. However, this particular species is notably rare among local home gardens.

Western red cedar is native to the Pacific Northwest. Its range extends south to the north coast of California, and east to western Montana. It therefore does not adapt efficiently to the arid warmth of local chaparral climates. Even with generous irrigation, its foliage can be vulnerable to desiccation. The healthiest specimens here are within coastal climates.

Like some other trees within its native range, western red cedar typically grows very big. It can easily reach a hundred and fifty feet tall, and can grow taller than two hundred feet. Although it does not grow as fast as redwood, it eventually needs about as much space. Western red cedar, here, is appropriate only for large landscapes within coastal climates. It is too obtrusive for compact home gardens.

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Confluence

There are too many bridges to count here. Several roads and trails, and a historic narrow gauge railroad cross over two creeks and two streams within a relatively confined area. This particular suspension bridge is for a hiking trail that crosses over Zayante Creek at the downstream edge of its confluence with Bean Creek. Bean Creek, which is to the upper right in the picture below, flows through the farm on the outskirts of Scotts Valley. Zayante Creek, which is to the left in the picture below, flows through my neighborhood on the outskirts of Los Gatos. Ferndell Creek, which is just a stream from a nearby spring, also flows into this same confluence, but is not visible to the right of the picture below.

All of these creeks and streams sustain even more diverse ecosystems than those of the redwood forests above, and the chaparral pine forests a bit father above. Redwoods grow like weeds here. The redwood in the picture below is what is known as a ‘virgin’ because it was not harvested for lumber when most others were clear cut harvested to sustain development of the San Francisco Bay Area, and to rebuild San Francisco after the Great Earthquake and Fire in 1906. It was most likely rejected because it was too small to bother with at the time. Only a century later, it is massive! The cables that are now embedded into its bark formerly supported an older suspension that the newer bridge replaced many years ago. Although redwoods are not necessarily a riparian species, and can actually be resilient to drought, they do enjoy this abundance of moisture. The many other trees that inhabit these ecosystems with them grow very tall to compete for sunlight, and in some situations are excluded by their dense growth.

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Horridculture – Deferred Road Maintenance

It is not on the road yet, but will be soon. This box elder has been deteriorating for several years. Only a few viable watersprouts remain within about ten feet of the ground. All limbs above are gone, leaving only this decomposing trunk. Several more similarly deteriorating trunks, with more or even less of their associated canopies remaining, are barely standing nearby. Most succumbed to an unidentified pathogen a few years ago. Some were dead prior to that. This one is special because such a significant portion of its upper trunk has broken off, and now remains suspended by the unbroken portion of the same trunk and the collective canopy of adjacent bay trees. This would not be such a concern if this broken portion of the trunk was not suspended so closely to the busy road below. (The picture above shows where the trunk broke. The picture below shows its proximity to the road below.) I suspect that when the broken portion of trunk eventually falls through the canopy of bay trees, the heavier basal end will fall first, and guide the lighter upper portion to land closer to the base of the remaining trunk, and safely away from the road, but I can not be certain until it actually happens. Those who maintain the road will not remove the broken portion of trunk until this does not actually happen, and the debris instead falls into the road. I can do nothing about it because I can not direct how the broken portion of trunk will fall once it is dislodged, and the traffic on the road is nearly constant during the day. It would be safer with a crew to stop traffic while the trunk is removed, and even better if they remove all of the several decaying trunks.

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Western Cottonwood

Western cottonwood is better in the wild than within refined gardens.

The brilliantly clear yellow autumn color of Western cottonwood, Populus fremontii, is best in the higher elevations and inland areas of its extensive range, which spreads from the coast of California to the Rocky Mountains and as far south as Mexico. Although it thrives in local riparian areas, particularly Coyote Creek and Guadalupe River, mild temperatures in both summer and winter do not allow it to get as colorful as it does in Nevada. It is almost never planted intentionally, but has a sneaky way of sometimes growing from seed in well watered gardens.

The bad news is that Western cottonwood grows big, fast and aggressively. The shallow roots displace pavement, compete with other desirable plants and damage septic and drainage systems. Large trees produce an abundance of annoyingly fuzzy seeds that adhere to anything. After causing so much damage, Western cottonwoods survive only a few decades, leaving big deteriorating carcasses that need to be removed before collapsing. Consequently, Western cottonwood is really suitable only for large open areas or in the wild.

Mature trees can be more than fifty feet tall and more than half as broad. Their somewhat thick leaves are almost triangular, with paired angular lobes on the sides and blunt tips. ‘Nevada’ is a male cultivar that does not produce fuzzy seeds.

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Six on Saturday: Away Again

It is a long story. To be brief, Rhody and I are again far away from work and home, near Phoenix in Arizona, without time to write.

1. Prosopis velutina, velvet mesquite is supposedly the most common mesquite here and is also native. It develops sculptural form, but only light shade, which seems to me to be substandard for such a warm climate. Perhaps it is common because it is undemanding.

2. Parkinsonia florida, blue palo verde is also native like velvet mesquite, but is only one of the two most common palo verdes here. Foothill palo verde is the other. Both develop sculptural form and light shade, also like velvet mesquite, and are a bit more sculptural.

3. Lantana montevidensis, trailing lantana is the same common type that I occasionally work with at home, but seems to be happier and more colorful here, even while shorn as these weirdly compact globs, and humiliatingly deprived of its naturally sprawling form.

4. Calliandra californica, Baja fairy duster seems to be more prevalent here than it is in California. Of course, Baja California is a very big and very diverse region to the south of the State of California that I am familiar with. I suspect that this is a hybrid or a cultivar.

5. Leucophyllum frutescens, Texas sage, like so much of the flowering shrubbery here, is shorn too abusively to bloom as well as it likely should. Its silvery gray foliar color is also compromised. I can not even guess what its natural form or branch structure should be.

6. Rhody is so tolerant of my interest in unfamiliar vegetation. His only interaction with it involves just ‘claiming’ it. I absconded with a handful of seed pods and three seedlings of velvet mesquite, and a seedlings of Baja fairy duster (which will get a different name).

This is the link for Six on Saturday, for anyone else who would like to participate: https://thepropagatorblog.wordpress.com/2017/09/18/six-on-saturday-a-participant-guide/

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Chinese Elm

Chinese elm is sculptural and textural.

Dutch elm disease became a serious problem for American elms in the 1930s. However, it did not reach California until half a century or so later. Chinese elm, Ulmus parvifolia, is not very susceptible to the disease, but is a vector. In other words, it can survive infection to share it with other species of elm. Consequently, it became unavailable by the 1980s.

Some mature specimens of formerly common Chinese elm still inhabit older landscapes. Younger specimens in newer landscapes are mostly ‘Drake’ Chinese elm. They are a bit more upright, with more symmetrical form. More importantly, they are not vectors of Dutch elm disease. Other cultivars that are also resistant are rarely available at local nurseries.

Classic and formerly common Chinese elm can eventually grow more than fifty feet high. Some can grow thirty feet wide to shade an entire urban front lawn. Some cultivars might grow nearly as high, but are generally not quite as broad. Their blotchy gray and tan bark adorns curvaceous limbs. Their small deciduous leaves are not very colorful for autumn. They can be copious, messy and quite tedious to rake.

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Horridculture – Headless

Appropriately, this picture was taken on Halloween. The ‘DEAD END’ sign and cemetery beyond, which are visible to the lower left of the picture, were also coincidental. The several headless redwood trees are the primary topic. Obviously, they were decapitated because of the electrical cables above. Otherwise, redwoods with such healthily plump trunks would be rather tall by now. After all, coastal redwoods are the tallest trees in the World. Unfortunately for them and those who are now appalled by their disfigurement, reliable and safe electrical service is more of a priority than poorly situated trees. It is no fault of the trees. Nor should this atrocity be blamed on those who executed it. Their only better option would be complete removal of the subjects, and perhaps replacement with smaller trees that will not grow tall enough to get too close to the electrical cables above. Maintenance of clearance of the vigorously upright redwoods from the cables above is a chronic problem that must be morally challenging for the arborist who must perform the necessary procedures. However, removal of several such significant trees would be very objectionable to the Community, which is very likely why these trees remain, regardless of their severe and irreparable disfigurement. Application for permits for their removal requires posting of such intentions on the trunks of the subject trees, to which neighbors would very likely protest. None of this would be such a problem now if only trees that are more appropriate to this particular situation were installed instead! Did the landscape designer who designed this landscape even visit the site during the design process, or was it all done on paper in a remote studio? Why did those who installed these trees not foresee this problem and modify the landscape plan and species selection accordingly?