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Rocky Mountain Juniper

Rocky Mountain junipers get rather large.

Hollywood juniper had formerly been the only popular juniper of tree form. As it became less popular during the past few decades, cultivars of the once obscure Rocky Mountain juniper, Juniperus scopulorum, became more popular. Also, a few more modern cultivars became available. Now, the once overly common Hollywood juniper is quite uncommon.

Rocky Mountain juniper is naturally rather grayish for protection from the harsh exposure of the high elevations which it inhabits. Cultivars are grayer, bluish or silvery, and mostly develop symmetrically conical form. Old specimens that were initially conical eventually grow as small trees with rounded and relatively dense canopies, perhaps on bare trunks.

‘Skyrocket’ and ‘Blue Arrow’ are very narrow like Italian cypress that grow only fifteen feet tall. ‘Wichita Blue’ and ‘Moonglow’ are stoutly conical. ‘Blue Arrow’ and ‘Wichita Blue’ are bluish green. ‘Skyrocket’ and ‘Moonglow’ are silvery gray. Established specimens do not require much water, but develop better foliar color with warmth and occasional watering.

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Juniper Cultivars Deserve More Consideration

Evergreen juniper foliage has distinctive texture.

Fads come and go. Many can be good, even if only briefly. A few might be bad enough to later stigmatize the object of the fad. For example, the formerly esteemed crape myrtle is now familiar as a mundanely common tree. Flashy bloom and complaisance contributed to its excessive popularity. Most sorts of juniper are similarly victims of their previous fad.

A few cultivars of juniper suddenly became overly popular during suburbanization of the 1950s. They were remarkably reliable and resilient. Most were shrubbery or low hedges. A few were groundcover. Hollywood juniper grew as a compact sculptural tree. However, most junipers grew too big. They became difficult to maintain, or impossible to renovate.

As many outgrew suburban gardens, few junipers outgrew their reputation. Even modern cultivars that were unavailable during the fad of the 1950s are perhaps less popular than they should be. Realistically, many old and new cultivars of juniper are quite practical for refined home gardens. They merely need to be appropriate to their particular application.

Many cultivars of several species of Juniperus are commonly available. Straight species are very rare from nurseries, although a few are native nearby. All junipers are evergreen with tiny awl or scale leaves. Foliar color ranges from forest green to silvery gray. Bloom is unremarkable. Some junipers produce pretty and aromatic blue, gray or black berries.

Junipers generally do not respond favorably to pruning that damages their natural forms. Those that grow as groundcovers, with stems that sprawl over the surface of the soil, are not offended by pruning to contain their edges. However, most groundcover junipers are actually just low shrubbery. Pruning might leave holes within their dense foliar canopies.

Junipers that grow as small trees do not mind removal of lower limbs at their main trunks, but object to partial pruning or ‘stubbing’ of such limbs. Regardless of their natural forms, all junipers should be proportionate to their particular applications. With sufficient space, they can mature and develop their naturally distinguished forms with minimal altercation. Maintenance could really be quite minimal.

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First Color Of Autumn

For this season, the best early color is that of the poison oak.

tonytomeo's avatarTony Tomeo

P91013Okay; so this is neither the first, nor real autumn foliar color. It just happened to be convenient for me to get a picture of. Someone left this unfortunate Japanese maple right outside on the driveway a few years ago. It colors early from uncomfortable exposure to late summer warmth. The picture below is even more colorful, and was from even earlier in the year, last August.

Foliage that is starting to color here is nothing to brag about. Some of the older dogwoods leaves just shrivel and turn brown. I can only hope that enough newer foliage lingers to color as well as it did last year. Cottonwoods start to drop foliage while it is still green, but should eventually color to a subdued yellow before the last foliage falls. Sycamores are bland no matter how late.

There are only a few trees that reliably develop vibrant foliar color…

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Electrical Outage

This recycled article reminds me that there were no such planned outages locally this season that I am aware of.

tonytomeo's avatarTony Tomeo

P91012KWarnings were broadcast in local news for a few days prior. Because of the extreme potential for catastrophic forest fires, electrical service was to be disabled to our region, and large areas of California. Weather was predicted to be warm, windy and dry (with minimal humidity). Such conditions are exactly what cause fires to spread so explosively through the overgrown forests.

The potential for sparks from electrical cables, especially as debris gets blown onto to them, was why the electricity needed to be disabled. Supposedly, it is more likely for fires to be started by sparks from utility cables than by sparks from the many generators and barbecues that compensate for a lack of electricity. These considerations are taken very seriously in this region.

There are many reasons why the local forests are more combustible than they would naturally be. The less combustible redwood forests were clear cut harvested about…

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Six on Saturday: L. A. II

Los Angeles was fun, even if merely for five days. So was the indirect trip there and back. While there, I collected a few bits and pieces of vegetation to bring back here. Much of it, including these Six, needed to be removed from Brent’s garden anyway. I want to collect more Plumeria cuttings later, during the correct season. I only took what I got from this procedure because two of the dozen or so specimens needed minor pruning. Conversely, I collected many more giant bird of Paradise seedlings than I can accommodate because they needed to be removed from where they were. A neighbor here should hopefully take most of them. Most of these acquisitions were expected, although the quantities of some were unexpectedly excessive. Nonetheless, I am very pleased with them.

1. Heliconia of an unidentified species was phased out as other vegetation matured over the past several years. Remnants came up with only bits of rhizome, so may not survive.

2. Strelitzia nicolai, giant bird of Paradise grew from seed from a very mature specimen that was the first plant that Brent installed after he moved here almost twenty years ago.

3. Plumeria of an unidentified cultivar or even species needed to be pruned off the roof. It grows easily from cuttings, such as these, but needs protection from minor frost here.

4. Washingtonia robusta, Mexican fan palm, like giant bird of Paradise, grew from seed from a recycled specimen that Brent installed. Its parent is his brother’s Memorial Tree.

5. Clivia miniata, Natal lily formerly bloomed profusely in the front garden, but became overwhelmed by other vegetation. They were installed directly into a landscape at work.

6. Chamaedorea costaricana, pacaya, which Brent and I know as bamboo palm, is much more vigorous and larger than the more common bamboo palm, Chamaedorea seifrizii.

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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Sweetgum

Sweetgum colors with minimal chill.

The excellent and remarkably brilliant shades of yellow, orange, red and burgundy of the foliage in autumn suggest that sweetgum, Liquidambar styraciflua, is from New England. However, it is native between New Jersey, Florida and the eastern edge of Texas, as well as isolated forests of Central America. It actually prefers mild climates to where winters are too cold. Mature trees are generally columnar (relatively narrow) and less than fifty feet tall where well exposed, but can get more than twice as tall to compete in forests.

Unfortunately, mature sweetgum trees can be somewhat problematic in urban gardens. Limbs are often weak enough to break in wind, or if they get too heavy from the weight of their own foliage. Also, the abundant round seed pods are outfitted with nasty spikes, like little maces almost two inches wide. They are painful to step on, and can actually be quite hazardous.

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Autumn Foliar Color Begins In October

After blooming so colorfully for summer, crape myrtle foliage turns bright orange and red for autumn.

Why do so many from other regions comment on the mild climates of the west coast of California as if pleasant weather is a deficiency? If horrid summer heat and frigid winter cold were worth bragging about, not so many people would have been so eager to migrate here.

Contrary to popular belief, the four seasons, although considerably milder than in other regions, are enough to keep our gardens productive, dynamic and even colorful in all seasons. All sorts of deciduous plants and fruit trees get just enough chill in winter to bloom reliably in spring. The warming weather between winter and summer that gets most plants to bloom is what spring is all about. Summer is then warm enough for fruit and vegetables to develop. Then there is autumn, when so many deciduous plants turn flashy colors before winter dormancy.

Although the mild weather limits the choices, there are still a few plants to provide autumn foliar color. Actually, autumn is not so colorful locally primarily because the potential for color is not exploited like it is elsewhere. There are just so many other plants that do not turn color in autumn to choose from. Really, Vermont would be less colorful if palm trees grew there!

Sweetgum, Chinese pistache, flowering pear and maidenhair tree are the most reliable trees for autumn color. Maidenhair tree turns remarkably bright yellow. The others get the whole range from yellow to orange to red. Sweetgum also gets burgundy, and has the added advantage of holding foliage until it gets knocked off by wind or rain. Where the big, bright orange (and yummy) fruit that hangs through winter is desirable, Japanese persimmon is as colorful as Chinese pistache. (Persimmons are horribly messy if not harvested.) Various poplars, tulip tree and black walnut can almost get as bright yellow as maidenhair tree.

Crape myrtle and redbud are shrubby plants that provide good autumn color. Redbud turns clear yellow. Crape myrtle though, can also get bright orange and brownish red. Several of the Japanese maples, although not always as reliable, can actually get even more colorful if the weather is right. Boston ivy (which is actually related to grape) is the most colorful of climbing vines, but because it attaches directly to whatever it climbs, it is best on concrete walls that it will not damage.

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Horridculture – Halloween

Goodness! I did not remember that the last paragraph of this three year old article was so . . . naughty.

tonytomeo's avatarTony Tomeo

P91009Halloween is a topic that I could rant about for days. Seriously. I loathe it. I dislike any formerly respectable holiday that has been ruined by excessive commercialization. We all know what happened to Christmas. For me, Halloween, in some regards, is even worse. Christmas is at least pretty. Halloween is intended to be morbid and grotesque and creepy and . . . just plain bad.

This should be about gardening though. Yes, there is always that guy who gets too drunk at the Halloween party down the road, but manages to stagger just far enough to vomit on my lawn. Then, I need to figure out how to get all the toilet paper out of the redwoods. The nasturtiums that get trampled by hasty brats who are too old for trick-or-treating will eventually recover.

The worst, though, are the Halloween ‘decorations’ in the front yard! We put too much…

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Dracaena Palm

Dracaena palm is a foliar plant.

By the end of the Victorian Period, dracaena palm, Cordyline australis, had become very popular, both as small trees and as foliar plants. The largest specimens were only about twenty feet tall and half as wide. Removal of trunks that grew too tall for short foliar plants induced fresh basal growth. The drab leaves grew three feet long and three inches wide.

Cultivars with bronzed foliage became more popular after the Victorian Period, although not as common as the original. They grew slower and stayed smaller. The many modern cultivars of the past few decades stay even smaller, with even more impressively colorful foliage. Most are purply bronze or variegated with creamy white, pale yellow, pink or tan.

Modern cultivars generally mature efficiently, but then attain height too slowly to function as small trees. Some do not develop substantial trunks. They are therefore more popular for their delightful foliar color and texture. Many generate appealingly pendulous foliage. However, a few eventually develop sculptural form with exposed corky trunks and limbs. Removal of unimpressive floral panicles prior to bloom removes floral frass before it gets messy.

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Common Names Are Potentially Uncommon

Lily is neither calla nor canna.

Nomenclature is simply a structured technique of naming. Botanic nomenclature assigns universally precise general or genus names with specific or species names to all plants. Such botanical names are also scientific and Latin names, but not common names. They are binomial with their uncapitalized species names after their capitalized genus names.

Latin, scientific or botanical names are the same for everyone everywhere, regardless of regional language. They simplify documentation and distribution of botanical information for plants that have different regional common names. Even if all other information needs translation, botanical names do not. They are really more common than common names.

Realistically, common names are no more common than common sense. Many regional names are common only within isolated or contained regions, such as individual islands of Polynesia. Aloalo of Hawaii are simply familiar hibiscus here. Lily of the Nile seems to be the only common name for Agapanthus, but is more familiar as thanh anh in Vietnam.

Acer platanoides is Latin for ‘maple which resembles a sycamore’. Acer pseudoplatanus is Latin for ‘maple which is a false sycamore’. Both are maples here, but also sycamores in England. Conversely, Platanus X acerifolia, which translates to ‘sycamore with maple foliage’ is a sycamore here, but a plane in England. Common names might be confusing.

This is why botanical names are so important. Arborists and horticulturists both here and in England recognize them regardless of possible inconsistencies with common names. Of course, common names are useful regionally. They may be easier to remember, more appealing or merely amusing. Pigsqueak and sticky monkey flower are difficult to forget.

Nonetheless, it might be helpful to be aware that some common names are inaccurate. A rose by any other name would smell as sweet, unless of course, it is a Confederate rose, Lenten rose, rose of Sharon or rock rose. None of such roses are actually roses. Neither calla lily nor canna lily is a real lily. Neither dracaena palm nor sago palm is a real palm.